MICHIGAN STATE BRAKES CERTIFICATION EXAM QUESTIONS AND ANSWERS

MICHIGAN STATE BRAKES CERTIFICATION EXAM QUESTIONS AND ANSWERS “Air in Hydraulic System - CORRECT ANSWER A spongy brake pedal may be caused by" "Movement of brake pad during braking - CORRECT ANSWER Causes disc brake squeal" "Incorrect master cylinder pushrod adjustment - CORRECT ANSWER Excessive pedal travel before brakes apply is caused by" "Properly operating - CORRECT ANSWER Power brakes that move down slightly when the engine is started with the brakes applied are" "Vacuum supply test - CORRECT ANSWER Checks the vacuum supply hose for kinks and checks the level of vacuum supplied by the engine or vacuum pump" "With the engine off - CORRECT ANSWER When performing a vacuum booster function test, you should begin by pumping the brake pedal several times" "Brinelling - CORRECT ANSWER Dented race (cup) on a beari g that has been shock loaded" "the set-up shown above (runout gauge on rotor) is used to check..? - CORRECT ANSWER lateral rotor runout" "Which of the following problems would be caused by using a residual check valve in a disc brake master cylinder? - CORRECT ANSWER increased brake pad wear" "customer complains that their vehicle pulls to the right when the brakes are applied. tech a says a restricted brake line to the left caliper can cause this problem. tech b says a malfunctioning proportioning valve is probably the cause. who is right? - CORRECT ANSWER Tech a" "with foot pressure applied, the brake pedal on a vehicle with vacuum assisted power brakes moves down slightly when the engine is started. tech a says that this condition can be caused by a leaking power brake booster diaphragm. tech b says that the cause could be a faulty power brake booster check valve. Who is right? - CORRECT ANSWER neither" "tech a says the tool shown above is used to adjust the brake shoes. tech b says that the tool is used to determine the inside diameter of the drum. who is right? - CORRECT ANSWER tech a" "the hydraulic system on a vehicle with integral abs is to be bled. tech a says that the front brakes can be bled on a conventional manner. tech b says that both front and rear brakes can only be bled using the pressure from a fully charged accumulator. who is right? - CORRECT ANSWER tech a" "a driver complains that the abs system on his car engages every time he applies the brakes on a cobblestone roadway he uses going back-and-forth to work. this condition means that..? - CORRECT ANSWER both A and B A: the system is operating normally B: the wheels are travelling at different speeds" "customer complains that the brake warning light comes on whenever the brake pedal is depressed while driving. all of the following could cause this to occur EXCEPT? - CORRECT ANSWER a short to ground in the warning light circuit" "The MOST common cause for premature front brake pad wear in a disc/drum system is..? - CORRECT ANSWER improperly adjusted rear shoes" "tech a says that DTCs can be accessed from any ABS system using flash diagnostics. tech b says that ABS system tests can be performed with a bi-directional scan tool. who is right? - CORRECT ANSWER tech b" "to determine in an intermittent ABS problem is related to an erratic wheel speed sensor signal, which of the following should be used ? - CORRECT ANSWER Digital Storage Oscilloscope" "a few minutes after the engine was turned of on a vehicle with vacuum power assist, the brake pedal is applied and it is hard to push. tech a says that this is a normal condition. tech b says that the booster check valve is leaking. who is right? - CORRECT ANSWER tech b" "The above measurement is made when replacing all of the following components EXCEPT? - CORRECT ANSWER brake caliper" "during a brake inspection, an area of the vacuum brake booster below the master cylinder is found to be damp. tech a says that this is a normal condition. tech b says that any evidence of fluid indicates a leak and the master cylinder must be replaced. who is right? - CORRECT ANSWER tech a" "tech a says that tapered roller bearings can be adjusted using a torque wrench. tech b says that tapered roller bearings are adjusted using a dial indicator. who is right? - CORRECT ANSWER both" "all of the following could cause a pulsation to be left in the brake medal EXCEPT? - CORRECT ANSWER seized caliper piston" "tech a says that any imperfection found in a phenolic caliper piston warrants replacement. tech b says that a phenolic caliper piston should be protected with a block of wood when installing it into the caliper bore with a c-clamp. who is right - CORRECT ANSWER tech b" "which of the following should be used to measure the thickness of a second rotor - CORRECT ANSWER outside micrometer with pointed anvil and spindle" "during routine vehicle maintenance, the fluid level in the master cylinder reservoir is checked. when the reservoir cap is removed, purple colored fluid is found in the reservoir. tech a says that this means the fluid should be topped off with dot 4, which has a higher boiling point than regular brake fluid. tech b says that this means that the fluid is contaminated; all rubber parts in the system must be replaced and the system flushed. who is correct? - CORRECT ANSWER neither" "a complete front brake service has just been performed on a vehicle with disc brakes: rotors turned, calipers rebuilt, new brake pads, bearings repacked and adjusted. However, when the vehicle is road tested, a pulsation can be felt, through the pedal. which is the most likely cause? - CORRECT ANSWER over-torqued lug nuts" "brake fluid leaking from a cracked line causes the brake light on the dashboard to come on in response to the loss of hydraulic pressure. which of the following valves in the hydraulic system switched on the light? - CORRECT ANSWER pressure differential valve" "tech a says that an integral abs system is an add-on system. tech b says that a non-integral abs system is a high pressure system. who is correct? - CORRECT ANSWER neither" "the diameter of drums mounted on the safe axle should measure within how many thousands of an inch of one another? - CORRECT ANSWER 0.010"" "absorption of 3% moisture can reduce the boiling point of DOT 3 brake fluid by what percentage? - CORRECT ANSWER 25%" "tech a says that surge bleeding is used in conjunction with manual or pressure bleeding. tech b says that surge bleeding is used to remove air that is trapped in the brake hydraulic system. who is right? - CORRECT ANSWER both" "all of the following are cause for brake rotor refinishing EXCEPT? - CORRECT ANSWER hard spots" "in the illustration above, tech a says that new brake shoes are being adjusted after installation. tech b says that the procedure shown above is being done so the brake drum can be removed. who is right? - CORRECT ANSWER tech b" "the front disc brake pads are being replaced on a vehicle with composite rotors. the left front rotor is scored below the 'machine to' but not the 'discard' thickness. the right front rotor has minor heat checks but otherwise checks out OK. if cast rotors are the only available replacements, which of the following is the proper course of action? - CORRECT ANSWER replace both rotors" "which of the following brake symptoms can be caused by wheel bearing problems? - CORRECT ANSWER pedal pulsation, brake pull, grabbing(all of the above)" "which component in the hydro boost system provides power assist if there is a loss of hydraulic pressure to the system? - CORRECT ANSWER accumulator" "a customer complains that the parking brake will not keep his car stationary. the car has four wheel disc brakes. tech a says the caliper levers could be out of adjustment. tech b says the brake shoes could need adjustment. who is right? - CORRECT ANSWER both" "when replacing an integral hub/bearing assembly on a front wheel drive vehicle, all of the following must be removed EXCEPT? - CORRECT ANSWER steering knuckle" "a wheel cylinder has been disassembled and corrosion and light scoring have been found in the bore. tech a says the bore can be refinished using a small hone lubed with cutting oil. tech b says oversize pistons and cup seals can be installed if the hone removes too much material. who is right? - CORRECT ANSWER neither" "two techs are discussing traction control systems. tech a says that some traction control strategies do not use the brakes to control wheel spin. tech b says that a fault in the abs does not affect traction control. who is right? - CORRECT ANSWER tech a" "when rough machining a brake drum, the depth of cut and spindle feed rate should be: - CORRECT ANSWER 0.010-0.015in at high feed rate" "in the test shown above, vacuum should: - CORRECT ANSWER exist on the booster side but not on the engine side" "tech a says the number on the brake drum shown above indicates the maximum diameter, beyond which the drum should not be used. tech b says the number indicates the maximum diameter the drum can be machined to. who is right? - CORRECT ANSWER tech a" "a vehicles brake warning system schematic is shown above. all of the following could cause the brake warning light to stay illuminated EXCEPT? - CORRECT ANSWER an open between C237 and C305" "a tech wants to check the condition of a vehicles brake fluid. where should he get the sample to make the most accurate determination? - CORRECT ANSWER brake caliper" "two techs are discussing brake bleeding procedures. tech a says gravity bleeding is a relatively quick way to bleed a brake system. tech b says silicone brake fluid cannot be gravity bled. who is right? - CORRECT ANSWER niether" "which of the following is the MOST cost-efficient method of correcting excessive lateral runout on a disc brake rotor? - CORRECT ANSWER indexing, machining" "new disc brake pads have just been installed. tech a says the new pads must undergo a burnishing process during the road test to 'cure' the pads. tech b says the new pads must be burnished to seat them on the rotor. who is right? - CORRECT ANSWER niether" "the parking brake pedal on a vehicle with automatic parking brake release remains depressed when the vehicle is placed in drive. all of the following are possible causes EXCEPT? - CORRECT ANSWER seized cables" "two techs are discussing electronic stability control (esc) systems. tech a says the ESC control module uses inputs from the steering wheel rotation sensor and wheel speed sensors to calculate the drivers intended path. tech b says the ESC control module uses inputs from the lateral acceleration and yaw rate sensors to calculate the vehicle's actual path. who is right? - CORRECT ANSWER both" "a vehicle exhibits intermittent ABS activation, but when the tech connects a scan tool to the DLC, no DTCs are found. which of the following could be the cause? - CORRECT ANSWER damaged tone wheel teeth, loose wheel bearing, rust under the wheel sped sensor mount(all of the above)" "tech a says as brake fluid ages, it can corrode ABS control valves. tech b says brake fluid corrodes the copper in the brake lines. who is right? - CORRECT ANSWER tech b" "which of the following is the MOST correct wheel cylinder repair procedure? - CORRECT ANSWER loosen the bleeder screw, disassemble, clean and hone, clean and assemble" "a vehicles ABS warning light is on and a DTC for the left front wheel speed sensor is found in the computers memory. when checked with an oscilloscope, the waveform for the left wheel speed sensor is erratic and uneven. tech a says the sensor air gap is excessive. tech b says the tone ring is probably damaged. who is correct? - CORRECT ANSWER tech b" "Excessive tire pressure - CORRECT ANSWER Can not cause very erratic brake pulling while applying brakes" "Excessive brake pedal travel - CORRECT ANSWER A power assist brake booster push rod that is too short will cause" "Brake drum machined beyond its limits - CORRECT ANSWER Can cause brake pedal fade" "Repair leak and replace brake linings - CORRECT ANSWER How to correctly service brake linings soaked with axle grease but still have a lot of lining left on them" "Metering Valve - CORRECT ANSWER Disc/Drum system, the front brakes lock up on light pedal application. This could be caused by a bad:" "Seized caliper piston - CORRECT ANSWER Will NOT cause a low brake pedal" "Air in the hydraulic system - CORRECT ANSWER A spongy brake pedal on a vehicle with 4-wheel disc brakes with a lower than normal travel indicates" "torque the adjusting nut to a specified torque and back off the nut until it lines up with the hole and install the cotter pin - CORRECT ANSWER When adjusting front wheel bearings, you" "check for ABS or TCS diagnostic trouble codes, or check for ABS or TCS blink codes by connecting two pins of the Data Link Connector - CORRECT ANSWER ABS and TRACTION OFF indicator lights remain ON with the engine running." "Standard process by many OEMS when a new rotor is installed - CORRECT ANSWER New rotors are indexed to the hub using a dial indicator for the least amount of runout" "ABS light does not go off after engine is started - CORRECT ANSWER Indicates an ABS fault and the system will revert to regular brake operation without ABS." on a car with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This problem could be caused by a bad.. - CORRECT ANSWER metering valve" "the drive of a vehicle with power disc/drum brakes says that the brake pedal moves slowly to the floor while maintaining pedal pressure at a spotlight. what could cause this problem? - CORRECT ANSWER leaking primary piston cup in master cylinder" "which of the following would most likely happen if the measurements taken from the check shown above varied from the manufacturer's specifications - CORRECT ANSWER pulsating brake pedal" "what is the purpose of the master cylinder residual check valve(s) on vehicles equipped with drum brakes - CORRECT ANSWER prevents air from entering the hydraulic system" "a tech has just overhauled the front brakes on a vehicle with front disc and rear drum brakes. however when he attaches a pressure bleeder to the master cylinder, he cannot get any fluid to come out of the disc caliper bleeder screws. which of the following is most likely the cause - CORRECT ANSWER metering valve valve release button not activated" "On a vehicle with single piston floating caliper front disc brakes, the brake pads on the left side of the vehicle are almost completely worn while the right side is almost new. tech a says that too much rotor runout could be the cause. tech b says that a binding caliper piston could be the cause. who is right. - CORRECT ANSWER tech b" "what is the purpose of the bar that is being removed from the brake assembly shown below - CORRECT ANSWER to force the shoes into the drum when the parking brakes are applied" "A hydraulic brake line is leaking. Which of the following is the correct repair procedure - CORRECT ANSWER Replace the leaking line with double-flared steel tubing" "two techs are discussing the duo-servo type drum brake design. tech a says the brake lining on the secondary shoe is usually longer and thicker than the brake lining on the primary shoe. tech b says the primary shoe is installed toward the rear of the vehicle. who is right? - CORRECT ANSWER tech a" "all of the following statements about leading-trailing type drum brakes are true EXCEPT? - CORRECT ANSWER they are self-energizing" "tech a says DOT 5 brake fluid has a lower boiling point than DOT 4. tech b says that DOT 4 brake fluid is silicone-based and should never be used in an abs system. who is right? - CORRECT ANSWER neither" "brakes that drag or fail to release can be cause by which of the following conditions in the master cylinder? - CORRECT ANSWER clogged compensating port" "all of the following could cause a hard brake pedal on a vehicle with power brakes EXCEPT? - CORRECT ANSWER a leak in the brake hydraulic system" "tech a says that a caliper seal installed in the caliper bore is called a stroking seal. tech b says that when the brake pedal is released, the piston in the caliper moves back in its bore due to the action of the piston seal. who is right? - CORRECT ANSWER tech b" "when replacing disc brake pads, you must bottom the caliper piston in its bore to create room for the new pads. which of the following is the proper procedure? - CORRECT ANSWER connect a hose the the caliper bleeder screw and insert the other end of the hose into a suitable container, open the bleeder screw, then use a C-clamp or plies to slowly bottom the piston in the caliper" "tech a says that all three-channel ABS systems use only 3 wheel speed sensors. tech b says that a four channel ABS system means that fluid pressure is independently regulated to each of the wheels during an ABS stop. who is right? - CORRECT ANSWER tech b" "tech a says that when a rotor is is machined, an equal amount of material must always be removed from both sides. tech b says that the minimum thickness dimension cast into the rotor is the dimension that the rotor can be machined to. who is right? - CORRECT ANSWER neither" "the purpose of an anti-lock brake system is to maintain tire (wheel) slip at what level? - CORRECT ANSWER a level between 10-20%" "while on a road test, a tech notices that the rear wheels lockup and the car skids when attempting to stop quickly from a high speed. the MOST LIKELY cause of this problem is a defective..? - CORRECT ANSWER proportioning valve" "excessive slack in the parking brake cables can be eliminated on most vehicles by making an adjustment at the..? - CORRECT ANSWER equalizer" "tech a says that, when testing a proportioning valve, the pressure at the outlet port to the rear brakes should rise at a faster rate, once transition pressure is reached. tech b says that vehicles with diagonally-split hydraulic systems must have the proportioning valve tested twice. who is right? - CORRECT ANSWER tech b" "all of the following disc brake rotor measurements can be performed using a micrometer EXCEPT? - CORRECT ANSWER runout" "which of the following disc brake caliper designs usually allow the brake pads to be removed without removing the caliper? - CORRECT ANSWER fixed" "after applying the brake pedal several times to deplete the fluid reserve in the accumulator of a hydro-boost system, a tech applies the brake pedal with moderate pressure and starts the engine - CORRECT ANSWER the pedal should initially move downward before rising up" "All of the following can cause disc brake squeal EXCEPT - CORRECT ANSWER grease on the linings" "Tech a says that when rebuilding a caliper with a stroking seat, the condition of the caliper bore surface is critical. Tech b says that when rebuilding a caliper with a fixed seal, the condition of the piston surface is the most important consideration. - CORRECT ANSWER Both" "All of the following can cause a vehicle to pull to one side when the brakes are applied. - CORRECT ANSWER blocked master cylinder compensating port" "tech a says that ABS wheel speed sensor gap should be adjusted with a non-magnetic feller gauge. Tech b says that a paper spacer can be used to adjust ABS wheel speed sensor gap but the paper must be removed before the vehicle is operated. Who is right? - CORRECT ANSWER Tech a" "When discussing wheel bearings, all of the following statements are true EXCEPT? - CORRECT ANSWER Tapered wheel bearings are most commonly used on drive axles" "all of the following could cause the parking brake to not hold a vehicle on a grade EXCEPT? - CORRECT ANSWER seized wheel cylinder" "to determine the serviceability of a brake drum, all of the following should be checked EXCEPT? - CORRECT ANSWER minimum thickness" "a vehicles brake pedal is pumped rapidly 20 times and then held down. the master cylinder cover is then removed and when the pedal is released, a geyser is seen coming from the reservoir. tech a says that this indicates that air is trapped in the system. tech b says that this means that fluid is being forced out of the cylinder bore through the compensating ports and is normal master cylinder operation - CORRECT ANSWER Tech a" "tech a says that RWAL ABS systems must be diagnosed using a scan tool. tech b says that the ABS warning light will only come on when there is a fault in the system. who is right? - CORRECT ANSWER niether" "all of the following are procedures for removing air from a hydraulic system EXCEPT? - CORRECT ANSWER bench bleeding" "all of the following can be used to apply a non-directional finish to a disc brake rotor EXCEPT? - CORRECT ANSWER fine file" "all of the following can cause a problem in the hydro boost system EXCEPT? - CORRECT ANSWER leaking check valve" "a customer says that he ahs just replaced his front brake pads himself and now the abs warning light is on. which of the following could be the cause? - CORRECT ANSWER damaged wheel speed sensor, incorrect wheel speed sensor gap, stuck abs solenoid valve(all of the above)" "drum brake drag can be caused by all of the following EXCEPT? - CORRECT ANSWER frozen star wheel" "tech a says the type of fitting shown above is common to all brake systems. tech b says the flare shown was formed with an inverted flaring tool. who is correct? - CORRECT ANSWER neither" "tech a says the rear brake shoes should be properly adjusted before adjusting the parking brake. tech b says the parking brake lever should be disengaged before adjusting the equalizer. who is right? - CORRECT ANSWER tech a" "which of the following should be used to clean a disc brake rotor after it is machined? - CORRECT ANSWER soap and water" "a front brake hose is being replaced. on this type of hose, the male end threads directly into the caliper. tech a says the end of the hose that attaches to the steel brake line should be connected first. tech b says that a new copper sealing washer should be used when the hose is connected to the caliper. who is right? - CORRECT ANSWER tech b"