SOS MECHANIC CERTIFICATION EXAM QUESTIONS WITH CORRECT ANSWERS

SOS MECHANIC CERTIFICATION EXAM QUESTIONS WITH CORRECT ANSWERS “Most 1995 & newer vehicles use which of the following types of wheels bearings on non-drive wheel? - CORRECT ANSWER Sealed non-serviceable" "Which of the following describes the proper way to depressurized an ABS system? - CORRECT ANSWER Pump the brake pedal at least 25 times (or more, depending on the manufacturer's recommendation) with the ignition off." "The rear brakes are dragging after having new linings installed and the drums machined. the most likely cause is the: - CORRECT ANSWER technician use the parking brake to adjust shoes and the cable is stuck" "When turning brake drums: - CORRECT ANSWER use a dampening strap to reduce chatter" "Which of the following is NOT a necessary drum brake measurement? - CORRECT ANSWER run-out" "On a 3-channel system, which wheels are on the same circuit? - CORRECT ANSWER both rear wheels" "One way to test an ABS wheel speed signal is to use _____ on your digital multimeter. - CORRECT ANSWER AC volts" "Which of the following is true about most properly functioning anti-lock brake systems? - CORRECT ANSWER The brakes may lock up at speeds less than 10 miles per hour" "Which of the following is true about bleeding brake lines on most ABS equipped vehicles? - CORRECT ANSWER Most ABS brake lines can be bled like a conventional (non-ABS) system. However, caution must be taken because of the extreme pressure." "Most anti-lock brake systems require the removal of the pressure modulator fuse when: - CORRECT ANSWER a "spaced-saver" spare tire is being used and mismatched tires are being installed" "What does a load sensing proportioning valve do? - CORRECT ANSWER It increases the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded" "The brakes of a car squeal each time they are applied, which of the following is the LEAST likely source of the noise? - CORRECT ANSWER Glazed brake pads" "What type of rotor surface provides the best braking with new pads? - CORRECT ANSWER A smooth, flat surface" "which of the following is a quick way to isolated a defective master cylinder? There are no external leaks in the system. - CORRECT ANSWER pump up the brake pedal, then hold it firm. if the pedal slowly drops to the floor, the master cylinder may be defective." "A common cause of pedal pulsation during brake application is: - CORRECT ANSWER NOT caused by improperly torqued wheels, damaged backing plates, or lubricated shims" "the car is at reset. When you slowly apply the brake pedal you hear a squeaking noise at the rear of the vehicle. what could cause this noise? - CORRECT ANSWER dry backing plate contact surfaces" "While test driving a car, the mechanic finds that the right front brake "grabs". The most likely cause of this problem is: - CORRECT ANSWER brake fluid or grease on the brake linings" "Which lining does most of the braking on a leading/trailing brake? - CORRECT ANSWER primary shoe" "This tool is used to? - CORRECT ANSWER Adjust the brake shoes to the drum" "Which of the following could be a symptom of over-torqued lug nuts? - CORRECT ANSWER A brake pedal pulsation during braking." "Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive vehicles: - CORRECT ANSWER RR, LR, RF, LF" "In disc brake caliper assemblies, the "square cut seal" is usually located: - CORRECT ANSWER In the caliper piston bore" "When performing a caliper overhaul, what would you use to remove the pistons from the calipers? - CORRECT ANSWER Compressed air" "Sliding caliper disc brake pads are kept in adjustment by the - CORRECT ANSWER Square cut piston seal" "When the brakes are applied on a car with disc-drum brakes, a vibration or pulsating movement is felt. What can cause this problem? - CORRECT ANSWER A rotor thickness variation" "A rattle is a single piston disc brake assembly which goes away when the brakes are applied is most likely a result of: - CORRECT ANSWER Loose pads in the caliper" "Which of the following would most likely cause dragging brakes? - CORRECT ANSWER A defective vehicle load sensor" "When repairing damaged brake line, which of the following is correct? - CORRECT ANSWER Replace entire line that is damaged with a new line bent to the right shape using a tube bender" "A customer complains that the brake pedal slowly moves to the floor when a steady pressure is applied. There is no sign of fluid leakage. Which of the following is the most portable cause of the problem? - CORRECT ANSWER A worn primary cup" "A car has an excessive amount of pedal travel during brake application, which of he following could be the cause? - CORRECT ANSWER Excessive clearance between the shoes and drum." In a single anchor bendix drum type rear brake - CORRECT ANSWER the secondary lining is longer than the primary" "Compared to the secondary shoe lining areas of drum brakes, the primary shoe lining area is: - CORRECT ANSWER smaller and goes toward the front of the car" "During a brake overhaul, you notice that the brake fluid seems to be very dirty and dark in color. What should you do? - CORRECT ANSWER flush the system before the new parts are installed" "In order to bleed the system on a vehicle equipped with power brakes: - CORRECT ANSWER None of the above" "Which of the following could be a symptom of over-torqued lug nuts? - CORRECT ANSWER A brake pedal pulsation during braking." "Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive vehicles: - CORRECT ANSWER RR, LR, RF, LF" "In disc brake caliper assemblies, the "square cut seal" is usually located: - CORRECT ANSWER In the caliper piston bore" "When performing a caliper overhaul, what would you use to remove the pistons from the calipers? - CORRECT ANSWER Compressed air" "Sliding caliper disc brake pads are kept in adjustment by the - CORRECT ANSWER Square cut piston seal" "A cracked or torn vacuum diaphragm in a power booster would likely cause: - CORRECT ANSWER Hard pedal with very high effort required" "When the brakes are applied on a car with disc-drum brakes, a vibration or pulsating movement is felt. What can cause this problem? - CORRECT ANSWER A rotor thickness variation" "While test driving a car, the mechanic finds that the right front brake "grabs". The most likely cause of this problem is: - CORRECT ANSWER Brake fluid or grease on the brake linings." "During a road test, you find that when normal breaking pressure is applied the pedal slowly goes to the floor. What is the likely cause of this problem? - CORRECT ANSWER A leaking master cylinder primary piston seal." "A rattle is a single piston disc brake assembly which goes away when the brakes are applied is most likely a result of: - CORRECT ANSWER Loose pads in the caliper" "Which of the following would most likely cause dragging brakes? - CORRECT ANSWER A defective vehicle load sensor" "With the car standing still, you can hear a squeaking noise when applying the brake pedal slowly. What could cause this noise? - CORRECT ANSWER Dry backing plate contact surfaces." "There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied. What is the likely cause of the problem? - CORRECT ANSWER A broken shoe hold-down spring or pin" "If a drum brake self-adjuster seizes up, the likely result will be: - CORRECT ANSWER A low pedal" "Which of the following can be used to check for rotor thickness variation? - CORRECT ANSWER Dial indicator" "On a vehicle with a disc/drum brake system, the rear wheels lock up under hard braking. The most likely cause is: - CORRECT ANSWER A defective proportioning valve" "The brakes of a car tend to drag, which of the following could be the cause? - CORRECT ANSWER A stuck wheel cylinder or caliper piston" "Which of the following conditions does not dictate that the brake hydraulic system be flushed after the necessary repairs have been made? - CORRECT ANSWER Evidence of air in the system" "When repairing damaged brake line, which of the following is correct? - CORRECT ANSWER Replace entire line that is damaged with a new line bent to the right shape using a tube bender" "Technician A says a bad brake hose may cause a fluid leak. Technician B says a defective bake hose may cause a restriction in the hydraulic circuit. Who is right? - CORRECT ANSWER Both A & B" "Technician A uses a pressure tester to check the operation of the accumulator, hydraulic pump, and controls of an ABS system during diagnosis. Technician B checks an ABS system by checking the codes in the control computers memory. Who is right? - CORRECT ANSWER Both A & B" "Technician A says that brake drums should never be matched beyond the maximum diameter designated on the drum. Technician B says that a brake drum with more than 0.005 inch out-of-roundness should be machined true on a lathe. Who is right? - CORRECT ANSWER Both A & B" "A customer complains that the brake pedal slowly moves to the floor when a steady pressure is applied. There is no sign of fluid leakage. Which of the following is the most portable cause of the problem? - CORRECT ANSWER A worn primary cup" "While discussing the effects of a leak in the primary hydraulic pressure system. Technician A says no pressure will be developed in the primary pressure chamber of the master cylinder. Technician B says he brakes served by the primary pressure chamber will not operate. Who is right? - CORRECT ANSWER Both A & B" "A car has an excessive amount of pedal travel during brake application, which of he following could be the cause? - CORRECT ANSWER Excessive clearance between the shoes and drum." "All of the following procedures, EXCEPT one describe the correct method for bleeding the individual brakes on a car after the master cylinder has been bled: - CORRECT ANSWER The bleeding sequence for all systems begins with the left rear wheel." "Technician A uses a silencer belt only on brake rotors that have heavy heat checks while matching them. Technician B always machines a brake rotor to the minimum thickness allowed. Who is right? - CORRECT ANSWER Neither A or B" "All of the following, EXCEPT one could cause the parking brakes to fail or not hold: - CORRECT ANSWER Air in the system" "Technician A says the accumulator in an ABS system is used to store hydraulic fluid to provide residual pressure for power assisted braking. Technician B says the booster pump in an ABS system provides pressurized hydraulic fluid for the ABS system. Who is right? - CORRECT ANSWER Both A & B" "While road testing a car with an ABS system, Technician A says during heavy braking, several clicks should be heard from the rear wheels as they try to lock up. Technician B says a spongy pedal during braking is normal. Who is right? - CORRECT ANSWER A only" "Technician A lubricates the pivot points and cables of the parking brake system whenever it is services. Technician B pulls he parking brake lever to its stop, then adjusts the cable so that the rear wheels are locked. Who is right? - CORRECT ANSWER A only" "Technician A says the dust boot of a brake cailiper should be removed and a large dull screwdriver used to pry the piston out of the bore. Technician B says air pressure should be injected into the bleeder screw's bore to force the piston out of the brake caliper. Who is right? - CORRECT ANSWER B only" "The brake warning light on the dash stays on all the time, which of the following could be the cause of the problem? - CORRECT ANSWER A problem in the hydraulic circuit" "Which of the following would be the LEAST likely cause for an intermittent problem in an ABS system? - CORRECT ANSWER Open wheel sensor circuit" "The front brakes of a car equipped with disc brakes in the front and drum brakes in the rear, grab quickly as light pressure is applied to the brake pedal, which of the following could be the cause of the problem? - CORRECT ANSWER Defective metering valve" "Technician A says when you are installing a new set of brake shoes a small amount of brake grease should be put on the heel and toe of the shoe. Technician B says when you are installing a new set of brake shoes, grease should be put on all areas of the backing place where there is metal-to-metal contact. Who is right? - CORRECT ANSWER B only" "Technician A says the above operation is necessary on some disc brake pads to secure them to the caliper. Technician B says that channel lock pliers should be used to clinch the shoe ears to the caliper housing. Who is right? - CORRECT ANSWER Both A & B" "The brake lights on a car do not light when the brake pedal is depressed, which of the following is the LEAST likely cause of the problem? - CORRECT ANSWER A burned out bulb." "Technician A says when the disc brakes anti-rattle springs are incorrectly positioned or missing, the brakes will rattle when they are not being applied. Technician B says if there is a rattle from the brakes when they are not applied, the caliper mounting bolts are probably loose. Who is right? - CORRECT ANSWER Both A & B" "What does a load sensing proportioning valve do? - CORRECT ANSWER It increases the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded" "If vacuum is present on both sides of the diaphragm in a brake booster: - CORRECT ANSWER The brakes are being released" "A mechanic finds gear lube inside both rear brake drums on a rear wheel drive vehicle. What is the most likely cause of this problem? - CORRECT ANSWER A plugged axle vent" "Which of the following is not a necessary precaution to follow when performing brake repairs on an ABS equipped vehicle? - CORRECT ANSWER Always remove the electronic brake control module fuse before adjusting or replacing a wheel speed sensor" "Which of the following is true when inspecting wheel speed sensors? - CORRECT ANSWER You should measure the air gap between the sensor and the reluctor wheel teeth" "Which of the following is true about most properly functioning anti-lock brake systems? - CORRECT ANSWER The brakes may lock up at speeds less than 10 miles per hour" "Which of the following would be the result of an inoperative ABS pump/motor assembly: - CORRECT ANSWER Conventional braking should still be available" "Which of the following is true about bleeding brake lines on most ABS equipped vehicles? - CORRECT ANSWER Most ABS brake lines can be bled like a convention ( non ABS) system (Caution must be taken because of the extreme pressure)" "Which of the following describes the proper way to depressurized an ABS system? - CORRECT ANSWER Pump the brake pedal at least 25 times (or more, depending on the manufacturer's recommendation) with the ignition off." "A common cause of pedal pulsation during brake application is: - CORRECT ANSWER NOT caused by improperly torqued wheels, damaged backing plates, or lubricated shims" "A properly functioning load sensing proportioning valve will: - CORRECT ANSWER cause an increase in the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded." "which of the following is a quick way to isolated a defective master cylinder? There are no external leaks in the system. - CORRECT ANSWER pump up the brake pedal, then hold it firm. if the pedal slowly drops to the floor, the master cylinder may be defective." "After rebuilding a master cylinder, the rod between the master cylinder and booster should be: - CORRECT ANSWER adjusted properly" "Upon inspecting brake fluid condition, the technician observes the diaphragm in the master cylinder cup is swollen. Which of the following is the most likely cause? - CORRECT ANSWER silicone fluid added to the system" "When inspecting brake fluid levels, a technician observes low fluid levels. which of the following should be done first? - CORRECT ANSWER Inspect disc brake pads for excessive wear" "During a road test, you find that when normal braking pressure is applied the pedal slowly goes to the floor. what is the most likely cause of this problem? - CORRECT ANSWER a leaking master cylinder primary piston seal" "Wheel speed sensors: - CORRECT ANSWER send an A/C signal to the control module" "Before replacing a hydralic brake hose on an ABS equipped vehicle, you should first: - CORRECT ANSWER relieve brake system pressure according to manufacturer procedures" "When would the pump motor be activated in an anti-lcok brake system with traction assist? - CORRECT ANSWER when brake pedal pulsates" "Which of the following is true about bleeding brake lines on most ABS equipped vehicles? - CORRECT ANSWER Most ABS brake lines can be bled like a conventional (non-ABS) system. However, caution must be taken because of the extreme pressure." "Flexible brake hoses should be replaced: - CORRECT ANSWER when dampness is evident on the hose" "When turning brake drums: - CORRECT ANSWER use a dampening strap to reduce chatter" "Which of the following is NOT a necessary drum brake measurement? - CORRECT ANSWER run-out" "You are installing a set of brake shoe linings that are not the same length. Traditionally, the primary shoe lining is: - CORRECT ANSWER Smaller and goes towards the front of the car." "the car is at reset. When you slowly apply the brake pedal you hear a squeaking noise at the rear of the vehicle. what could cause this noise? - CORRECT ANSWER dry backing plate contact surfaces" Bleeding a power steering unit is generally done by - CORRECT ANSWER turning the steering wheel left and right repeatedly" "After rounding a turn, the front wheels do not return to the straight ahead position in a normal way. What adjustment is most likely to be out of specifications? - CORRECT ANSWER Caster" ""Toe" adjustment on front wheel drive vehicles is made by: - CORRECT ANSWER changing he length of the steering linkage" "When performing a front-end alignment what should you do before you adjust the toe setting? - CORRECT ANSWER adjust the caster & camber" "Front-wheel toe-in adjustment on rear-wheel drive vehicles is made by: - CORRECT ANSWER changing the length of the steering linkage" "A mechanic is going to adjust the curb height on a car with torsion bars. To do this the car should be checked: - CORRECT ANSWER on a level surface with the car at curb weight" "A proper way to check ball joints for wear is by: - CORRECT ANSWER visual observation of the wear indicator & unloading the ball joint and using a pry bar and a dial indicator" "which of the following adjustments can be made on all vehicles with MacPherson strut suspensions? - CORRECT ANSWER Toe settings" "You are checking the war on ball joints with a dial indicator at the wheel rim. What must you do to get accurate readings? - CORRECT ANSWER check the wheel bearing adjustment and correct if needed" "While replacing a ball joint, you notice that the tapered hole in the steering knuckle is oval shaped. What should you do about this? - CORRECT ANSWER Inform the customer that the knuckle should be replaced." "If the upper ball joints are positioned ahead of the lower ball joints, the condition is: - CORRECT ANSWER Negative caster" "What is true of most MacPherson type suspensions? - CORRECT ANSWER There is no upper control arm." "A mechanic has set caster, camber, and toe-in to specifications. On the road test afterwards, the mechanic notices that the steering wheel spokes are off center to the left. What should be done to fix this? - CORRECT ANSWER Adjust both tie rod sleeves equally to move the front wheels in the direction of the steering wheel error" "Ball joints with wear indicators should be checked: - CORRECT ANSWER when loaded and by visual observation" "There is a looseness in the steering column, which of these could cause this problem? - CORRECT ANSWER Loose steering column universal joints" "Which of these could cause dangerous handling, uncomfortable ride, and noise due to excessive sideways body movement? - CORRECT ANSWER Broken rear track bar" "A vehicle has unusual noises when it is jounced up and down, all of these could cause this problem except: - CORRECT ANSWER worn tie rod ends" "If the upper ball joint is positioned behind the lower ball joint, which of these describes the alignment condition? - CORRECT ANSWER Positive caster." "Which of these correctly states when a power steering system should be bled? - CORRECT ANSWER When the fluid becomes aerated" "While diagnosing a vehicle that has a tendency to bump steer, which of these should be checked first? - CORRECT ANSWER Wheel setback" "Which of these is NOT part of the normal procedure for replacing a front stabilizer bar? - CORRECT ANSWER Disconnect the tie-rod ends" "Which of these does NOT need to be checked prior to a wheel alignment? - CORRECT ANSWER Tire balance" "Which of these can cause front wheel shimmy? - CORRECT ANSWER Loos steering linkage" "Which of these would cause the tires to wear in the center of a tire tread? - CORRECT ANSWER over inflated tires" "Which of the following is correct statements about the effects of the imbalance? - CORRECT ANSWER Static imbalance will cause wheel tramp" "Which of these is not a possible cause for an increase in steering effort? - CORRECT ANSWER Worn ball joints" "Which of these correctly states the purpose of the pop rivet found in some strut top plates? - CORRECT ANSWER The rivet secures the plate I position to maintain camber" "A car pulls to the left, which of these could cause the problem? - CORRECT ANSWER Left front wheel has too much negative caster" "A tire wobbles from side to side, which of these could cause this problem? - CORRECT ANSWER Lateral runout" "Which of these is NOT a correct method for adjusting tapered roller-type front wheel bearings on a RWD vehicle: - CORRECT ANSWER Tighten the adjusting nut until the wheel cannot be turned, then loosen it until the wheel can rotate" "Which of these is a common way to adjust camber on a vehicle equipped with a strut suspension system? - CORRECT ANSWER Turn an eccentric cam bolt at the base of the strut" "Which of the following is an effective way to check for a bent strut? - CORRECT ANSWER Compare the loaded and unloaded camber readings of the two front wheels" "Toe-In - CORRECT ANSWER Define" "Toe-Out - CORRECT ANSWER Define" "Positive Camber - CORRECT ANSWER Define" "Negative Camber - CORRECT ANSWER Define" "Positive Caster - CORRECT ANSWER Define" "Negative Caster - CORRECT ANSWER Define" "A MacPherson suspension system - CORRECT ANSWER has no upper control arm" "A Double Wishbone suspension system - CORRECT ANSWER has upper and lower control arms" "Name the Tread Wear and how it is caused - CORRECT ANSWER Feathered Edges: Caused by improper toe and results in outer tread wear on ONE SIDE of the tire" "Name the Tread Wear and how it is caused - CORRECT ANSWER Underinflation: Caused by driving on underinflated tires for long periods of time and results in outside tread wear on both sides of the tire" "Name the Tread Wear and how it is caused - CORRECT ANSWER Overinflation: Caused by driving on overinflated tires for long periods of tire and results in center tread wear" "Name the Tread Wear and how it is caused - CORRECT ANSWER Camber Wear: Caused by improper camber and wears the tread on half of the tire" "Name the Tread Wear and how it is caused - CORRECT ANSWER Chopped Wear: Caused by lack of rotation or unbalanced tires and wears tread in various spots creating a chopped tread" "Name the Tread Wear and how it is caused - CORRECT ANSWER Cupped Wear: Caused by excessive wheel jounce from worn suspension and creates bald spots on the tread" "This would Increase Caster - CORRECT ANSWER How would adding/subtracting shims as performed in the picture effect the alignment (Note the location of the front of the vehicle)" "This would Decrease Caster - CORRECT ANSWER How would adding/subtracting shims as performed in the picture effect the alignment (Note the location of the front of the vehicle)" "This would Increase Camber - CORRECT ANSWER How would adding/subtracting shims as performed in the picture effect the alignment (Note the location of the front of the vehicle)" "This would Decrease Camber - CORRECT ANSWER How would adding/subtracting shims as performed in the picture effect the alignment (Note the location of the front of the vehicle)" "This movement would Increase Caster - CORRECT ANSWER How would moving toward B effect the alignment?" "This movement would Decrease Camber - CORRECT ANSWER How would moving toward C effect the alignment?" "This movement would Decrease Caster - CORRECT ANSWER How would moving toward A effect the alignment?" "This movement would Increase Camber - CORRECT ANSWER How would moving toward D effect the alignment?" "Tighten the castle nut slightly in order to line the slot on the castle nut up with the hole in order to install the castle nut. Never loosen it below torque specification - CORRECT ANSWER After tightening a castle nut on a ball joint to the torque specification you find the hole for the cotter pin in the stud does not line up with a slot on the castle nut and you are unable to install the cotter pin.... Should you tighten the nut slightly to line up the slot with the hole or loosen it slightly to line up the slot with the hole? "you will see 2 similar answers clue is a number 45 just pick the longer answer"" "How to adjust toe on rack and pinion suspension, thus changing the length of the steering linkage - CORRECT ANSWER Loosen the lock nut and turn the inner tierod" "Loosen the locking sleeve nuts and rotate the adjusting sleeve, thus changing the length of the steering linkage - CORRECT ANSWER How to adjust toe on a parallelogram system" "An imaginary line that is drawn perpendicular from the centerline of the rear axle, down the centerline of the vehicle - CORRECT ANSWER What is the thrust angle?" "An out-of-position axle or incorrect toe setting - CORRECT ANSWER What is the cause of an off-set thrust angle?" "Diagonal tire wear, pulling or drifting while driving and an off-set steering wheel - CORRECT ANSWER What is the effect of an off-set thrust angle?" "During low speed operation - CORRECT ANSWER When does variable assist power steering provide maximum pressure?" "During high speed operations - CORRECT ANSWER When does variable assist power steering provide minimum pressure?" "Is Caster adjustable on all vehicles? - CORRECT ANSWER Caster is NOT adjustable on some vehicle" "What are shim adjusted control arms used on? - CORRECT ANSWER Typically used on older RWD vehicles that contain front SLA suspension" "In what sequence should an alignment be performed? - CORRECT ANSWER Caster, camber, toe (in that order)" "What is not a tire wearing angle? - CORRECT ANSWER Caster" "What causes a steering wheel to return to center? - CORRECT ANSWER A normal positive caster angle" "How does Caster effect which way a vehicle pulls - CORRECT ANSWER Vehicles will pull to the side with more negative caster" "How does Camber effect which way a vehicle pulls - CORRECT ANSWER A vehicle will pull to the side with more positive camber" "What is a typical camber angle - CORRECT ANSWER Close to zero to provide maximum tire contact with the road" "How would you compensate toe for road crown? - CORRECT ANSWER Left side tire with slight toe out and right side tire with toe in" "to test a vacuum power brake booster in the vehicle, you should pump the brake pedal at least 4 times, hold the brake pedal depressed, and start the engine. the brake pedal should: - CORRECT ANSWER drop slightly and remain firm" "You are installing a set of brake shoe linings that are not the same length. Traditionally, the primary shoe lining is: - CORRECT ANSWER Smaller and goes towards the front of the car." "A cracked or torn vacuum diaphragm in a brake power booster would most likely cause: - CORRECT ANSWER a hard pedal feel requiring very high pedal effort to stop" "A mechanic finds gear lube inside both rear brake drums on a rear wheel drive vehicle. What is the most likely cause of this problem? - CORRECT ANSWER A plugged axle" "Which of the following incorrect service procedures will cause brake lock-up? - CORRECT ANSWER master cylinder push rod adjusted too long" "The key input for the ABS control module comes from the: - CORRECT ANSWER wheel speed sensors" "ABS speed sensor and sensor rings: - CORRECT ANSWER should not be hammered or tapped on and should always be replaced as a matched set" "Flexible brake hoses should be replaced: - CORRECT ANSWER when dampness is evident on the hose" "Which of the following should be used to check for rotor thickness variation: - CORRECT ANSWER Micrometer" "After rebuilding a master cylinder, the rod between the master cylinder and booster should be: - CORRECT ANSWER adjusted properly" "Upon inspecting brake fluid condition, the technician observes the diaphragm in the master cylinder cup is swollen. Which of the following is the most likely cause? - CORRECT ANSWER silicone fluid added to the system" "When inspecting brake fluid levels, a technician observes low fluid levels. which of the following should be done first? - CORRECT ANSWER Inspect disc brake pads for excessive wear" "Which of the following is a true statement about proportioning valves? - CORRECT ANSWER They provide better braking balance during hard stops" "A properly functioning load sensing proportioning valve will: - CORRECT ANSWER cause an increase in the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded." "Why don't disc brake system usually need adjustment? - CORRECT ANSWER A certain amount of pressure is maintained by the metering valve" "The front brakes of a car equipped with disc brakes in the front and drum brakes in the rear, grab quickly as light pressure is applied to the brake pedal, which of the following could be the cause of the problem? - CORRECT ANSWER Defective metering valve" "The brake warning light on the dash stays on all the time, which of the following could be the cause of the problem? - CORRECT ANSWER A problem in the hydraulic circuit" "Which of the following would be the LEAST likely cause for an intermittent problem in an ABS system? - CORRECT ANSWER Open wheel sensor circuit" "The brake lights on a car do not light when the brake pedal is depressed, which of the following is the LEAST likely cause of the problem? - CORRECT ANSWER A burned out bulb." "Which of the following incorrect service procedures could cause brake pedal pulsation? - CORRECT ANSWER incorrect run-out on the car brake lathe" "Wheel speed sensors: - CORRECT ANSWER send an A/C signal to the control module" "Which of the following incorrect service procedures will cause brake lock up? - CORRECT ANSWER Master Cylinder push rod adjusted too long" "During a road test, you find that when normal breaking pressure is applied the pedal slowly goes to the floor. What is the likely cause of this problem? - CORRECT ANSWER A leaking master cylinder primary piston seal." "Before replacing a hydralic brake hose on an ABS equipped vehicle, you should first: - CORRECT ANSWER relieve brake system pressure according to manufacturer procedures" "When would the pump motor be activated in an anti-lcok brake system with traction assist? - CORRECT ANSWER when brake pedal pulsates" "There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied. What is most likely the cause of the problem? - CORRECT ANSWER a broken shoe hold-down spring or pin" "If a drum brake self-adjuster seizes up, the likely result will be: - CORRECT ANSWER NOT a low pedal, worn or brake drum, or a loose emergency brake cable." "After drum brakes have been applied and released, the brake fluid returns to the master cylinder reservoir. What causes it to return? - CORRECT ANSWER brake shoe return springs" "On a single anchor duo-servo drum brake system, which shoe does most of the braking? - CORRECT ANSWER secondary shoe" "There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied. What is the likely cause of the problem? - CORRECT ANSWER A broken shoe hold-down spring or pin" "Which of the following can be used to check for rotor thickness variation? - CORRECT ANSWER Dial indicator" "On a vehicle with a disc/drum brake system, the rear wheels lock up under hard braking. The most likely cause is: - CORRECT ANSWER A defective proportioning valve" "After putting a bearing race in a hub, you notice that the new race is loose and can spin in the hub. What should you do? - CORRECT ANSWER Replace the hub" "When adjusting disc-drum brakes, you should: - CORRECT ANSWER Adjust the rear brakes after releasing the parking brakes" "You are rebuilding a master cylinder. What should you use to lubricate the internal parts? - CORRECT ANSWER Brake fluid" "Which of the following is the most likely cause of low fluid level in the master cylinder? - CORRECT ANSWER Worn brake pads and linings" "Which of the following describes the correct sequence for bleeding brake lines on most front wheel drive vehicles? - CORRECT ANSWER RR,LR, RF, LF" "All of the following are steps in the procedure for servicing a typical dual master cylinder, EXCEPT: - CORRECT ANSWER Clean the master cylinder with a degreasing solvent" "The brakes of a car tend to drag, which of the following could be the cause? - CORRECT ANSWER A stuck wheel cylinder or caliper piston" "All of the following procedures, EXCEPT one describe the correct method for bleeding the individual brakes on a car after the master cylinder has been bled: - CORRECT ANSWER The bleeding sequence for all systems begins with the left rear wheel." "Which of the following is the LEAST likely cause of one brake dragging? - CORRECT ANSWER A corroded master cylinder bore" "A car has a spongy pedal. Which of the following could be the cause? - CORRECT ANSWER Air in the system." "Which of the following is not correct in the procedure for preparing a brake rotor for matching? - CORRECT ANSWER Use a brake micrometer to measure the diameter" "A car equipped with a vacuum assist power brake system reads an abnormal amount of pedal effort to stop the car, which of the following could be the cause? - CORRECT ANSWER A plugged booster air breather" "All of the following, EXCEPT one could cause the parking brakes to fail or not hold: - CORRECT ANSWER Air in the system" "An example of an incorrect procedure for replacing brake pads in a disc brake system is: - CORRECT ANSWER Remove the piston from the caliper and clean all rust corrosion, and dirt" "A car's wheels severely vibrate when the brakes are applied, which of the following is the LEAST likely source of he problem? - CORRECT ANSWER The master cylinder" "If vacuum is present on both sides of the diaphragm in a brake booster: - CORRECT ANSWER The brakes are being released" "Which of the following is not a necessary precaution to follow when performing brake repairs on an ABS equipped vehicle? - CORRECT ANSWER Always remove the electronic brake control module fuse before adjusting or replacing a wheel speed sensor" "Which of the following is true when inspecting wheel speed sensors? - CORRECT ANSWER You should measure the air gap between the sensor and the reluctor wheel teeth" "Which of the following would be the result of an inoperative ABS pump/motor assembly: - CORRECT ANSWER Conventional braking should still be available" "What information might be found on a brake drum to help a mechanic? - CORRECT ANSWER The maximum diameter dimension" "When checking a newly turned drum before putting it back on, you notice a thread-like grooves in the braking surface. Why are the grooves there? - CORRECT ANSWER The lathe was not adjusted properly when the drum was turned" "After putting a bearing race in a hub, you notice that the new race is loose and can spin in the hub. What should you do? - CORRECT ANSWER Replace the hub" "When adjusting disc-drum brakes, you should: - CORRECT ANSWER Adjust the rear brakes after releasing the parking brakes" "What type of rotor surface provides the best braking with new pads? - CORRECT ANSWER A smooth, flat surface" "Which of the following is a quick way to determine whether the master cylinder is bad? There are no external leaks in the system. - CORRECT ANSWER Pump up the brake pedal, then hold it firm. If the pedal slowly drops to the floor, the master cylinder is bad." "You are rebuilding a master cylinder. What should you use to lubricate the internal parts? - CORRECT ANSWER Brake fluid" "Which of the following is the most likely cause of low fluid level in the master cylinder? - CORRECT ANSWER Worn brake pads and linings" "After drum brakes have been applied and released, the brake fluid returns to the master cylinder reservoir. What causes it to return? - CORRECT ANSWER Brake shoe return springs" "Which of the following describes the correct sequence for bleeding brake lines on most front wheel drive vehicles? - CORRECT ANSWER RR,LR, RF, LF" "Technician A says that excessive pedal travel can be caused by low brake fluid levels; Technician B says that the excessive pedal travel can be caused by air in the hydraulic system? Who is right? - CORRECT ANSWER Both A and B" "All of the following are steps in the procedure for servicing a typical dual master cylinder, EXCEPT: - CORRECT ANSWER Clean the master cylinder with a degreasing solvent" "Technician A says it is normal for the amber "Anti-Lock Brake" lamp to light when the system is activated during braking. Technician B says it is normal for the red "Anti-Lock Brake" lamp to be on whenever the ignition is on and the engine is off. Who is right? - CORRECT ANSWER Neither A or B" "When adjusting the front wheel bearings of a rear-wheel-drive car: Technician A tightens the adjusting nut until there is no tire wobble. Technician B tightens the adjusting nut to the appropriate torque, then tightens it slightly more to line the castellations of locking nut with the cotter pin hole. Who is right? - CORRECT ANSWER Neither A or B" "Technician A says it is normal for brake shoes to have excessive wear in the center of the shoe. Technician B says if the lining is less than 1/32 of an inch above the rivets, it should be replaced. Who is right? - CORRECT ANSWER B only" "Technician A bench bleeds the master cylinder before installing it on the car. Technician B depresses the pistons and allows gravity to push air out of the master cylinder before connecting the brake lines to the master cylinder. Who is right? - CORRECT ANSWER A only" "Which of the following is the LEAST likely cause of one brake dragging? - CORRECT ANSWER A corroded master cylinder bore" "A car has a spongy pedal. Which of the following could be the cause? - CORRECT ANSWER Air in the system." "Technician A says a stuck caliper piston can cause the car to pull during braking. Technician B says a broken return spring in a rear drum brake can cause the car to pull during braking. Who is right? - CORRECT ANSWER Both A & B" "Which of the following is not correct in the procedure for preparing a brake rotor for matching? - CORRECT ANSWER Use a brake micrometer to measure the diameter" "A car equipped with a vacuum assist power brake system reads an abnormal amount of pedal effort to stop the car, which of the following could be the cause? - CORRECT ANSWER A plugged booster air breather" "While diagnosing a braking problem on a car equipped with a vacuum power booster: Technician A says excessive pedal travel can be caused by a leaking check valve. Technician B says excessive pedal travel can e caused by an improperly adjusted master cylinder push rod. Who is right? - CORRECT ANSWER B only" "While discussing the probable causes for a slow returning brake pedal: Technician A says a leaking hydraulic line could cause the problem. Technician B says a clogged quick take-up valve could cause the problem. Who is right? - CORRECT ANSWER B only" "An example of an incorrect procedure for replacing brake pads in a disc brake system is: - CORRECT ANSWER Remove the piston from the caliper and clean all rust corrosion, and dirt" "Technician A says brake shoe hold-down springs prevent the self-adjusters from setting the shoes too lightly against the drums. Technician B says the operation of a cable-type self-adjuster can be checked by prying the secondary shoe away from the anchor bolt and watching the action of the cable. Who is right? - CORRECT ANSWER B only" "A car's wheels severely vibrate when the brakes are applied, which of the following is the LEAST likely source of he problem? - CORRECT ANSWER The master cylinder" "Which of the following is a true statement about proportioning valves? - CORRECT ANSWER They provide better braking balance during hard stops" "Technician A says if the cylinder bore of a wheel cylinder is greater than specifications, a larger set of seals should be used. Technician B says that flat spots or grooves in a wheel cylinder's bore are normal. Who is right? - CORRECT ANSWER Neither A or B" "Technician A says all proportioning valves are adjustable. Technician B says only proportioning valves that are height sensing can be adjusted. Who is right? - CORRECT ANSWER B only" "The brakes of a car squeal each time they are applied, which of the following is the LEAST likely source of the noise? - CORRECT ANSWER Glazed brake pads" "Technician A says the diameter of a brake drum is measured with a brake drum micrometer and the measurement should be taken in several locations. Technician B says the wall thickness of a brake drum should be measured with a micrometer. Who is right? - CORRECT ANSWER A only" "Most anit-lock brake systems require the removal of the pressure modulator fuse when: - CORRECT ANSWER A "space-saver" spare tire is being used" "What information might be found on a brake drum to help a mechanic? - CORRECT ANSWER The maximum diameter dimension" "When checking a newly turned drum before putting it back on, you notice a thread-like grooves in the braking surface. Why are the grooves there? - CORRECT ANSWER The lathe was not adjusted properly when the drum was turned" “A cracked or torn vacuum diaphragm in a brake power booster would most likely cause: - CORRECT ANSWER a hard pedal feel requiring very high pedal effort to stop" "to test a vacuum power brake booster in the vehicle, you should pump the brake pedal at least 4 times, hold the brake pedal depressed, and start the engine. the brake pedal should: - CORRECT ANSWER drop slightly and remain firm" "A mechanic finds gear lube inside both rear drums on a rear wheel drive vehicle. What is most likely the cause of this problem? - CORRECT ANSWER a plugged axle" "The rear brakes are dragging after having new linings installed and the drums machined. the most likely cause is the: - CORRECT ANSWER technician use the parking brake to adjust shoes and the cable is stuck" "While test driving a car, the mechanic finds that the right front brake "grabs". The most likely cause of this problem is: - CORRECT ANSWER brake fluid or grease on the brake linings" "Which of the following incorrect service procedures will cause brake lock-up? - CORRECT ANSWER master cylinder push rod adjusted too long" "Which of the following incorrect service procedures could cause brake pedal pulsation? - CORRECT ANSWER incorrect run-out on the car brake lathe" "Most anti-lock brake systems require the removal of the pressure modulator fuse when: - CORRECT ANSWER a "spaced-saver" spare tire is being used and mismatched tires are being installed" "ABS speed sensor and sensor rings: - CORRECT ANSWER should not be hammered or tapped on and should always be replaced as a matched set" "One way to test an ABS wheel speed signal is to use _____ on your digital multimeter. - CORRECT ANSWER AC volts" "The key input for the ABS control module comes from the: - CORRECT ANSWER wheel speed sensors" "Which one of the following describes the proper way to depressurize an ABS system? - CORRECT ANSWER pump the brake pedal at least 25 times or more, depending on the manufacturer's recommendation, with the ignition on, but engine not running." "On a 3-channel system, which wheels are on the same circuit? - CORRECT ANSWER both rear wheels" "There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied. What is most likely the cause of the problem? - CORRECT ANSWER a broken shoe hold-down spring or pin" "If a drum brake self-adjuster seizes up, the likely result will be: - CORRECT ANSWER NOT a low pedal, worn or brake drum, or a loose emergency brake cable." "After drum brakes have been applied and released, the brake fluid returns to the master cylinder reservoir. What causes it to return? - CORRECT ANSWER brake shoe return springs" "On a single anchor duo-servo drum brake system, which shoe does most of the braking? - CORRECT ANSWER secondary shoe" "A mechanic jacks up a car, stands facing it, places a hand on the front of each tire. The mechanic pushes out and then pulls in on both tires. Too much movement would most likely mean that: - CORRECT ANSWER the tie rod ends are worn" "Which of the following should be checked first thing when doing a front-end alignment? - CORRECT ANSWER Curb height" "To counteract road crown, most manufacturers recommend that the left front wheel be adjusted to have: - CORRECT ANSWER Less positive (+) caster than the right" "If the toe-in is too great, the tread will most likely show: - CORRECT ANSWER feathered edges on both front tires" "When a wheel alignment is done on a car with front torsion bars, what should be checked and adjusted first? - CORRECT ANSWER Curb height" "Which of the following would be a typical automobile front end camber setting? - CORRECT ANSWER -3 degrees +/- 2 1/4 degrees its not the correct answer" "A mechanic finds that a front tire is worn on the inside of the tread only. The mechanic checks the air pressure and finds it correct. What is causing this problem? - CORRECT ANSWER The camber is set too negative" "A car will pull to: - CORRECT ANSWER the side with the most positive (+) camber" "One front tires shows spotty or isolated cupping and worn spots. What is the most likely cause of this problem? - CORRECT ANSWER An out-of-balance tire." "Before you remove a brake rotor from a hub, you should: - CORRECT ANSWER mark the position of the rotor" "The front wheels shimmy or bounce above 40mpg, even on a smooth, straight road. The likely cause of this problem is: - CORRECT ANSWER Tires out of balance"