Michigan ASE Brakes A5 Test Exam 2 Correct 100%

The brakes are dragging on a vehicle. this could be cause by a. overfilled master cylinder reservoir b. low vacuum to the boost c. bypassing master cylinder d. quick take-up valve stuck open - Answer A : overfilled master cylinder reservoir why : an overfilled master cylinder reservoir cylinder would not allow for fluid expansion. this would cause the brakes to self apply as the fluid expanded as result in brake drag The brake pads are worn at an angle on a vehicle with a sliding brake caliper system. which of the following is most likely the cause? a. worn caliper piston b. worn caliper bushings c. leaking caliper seal d. leaking caliper boot - Answer B : worn caliper bushings why : worn bushings can cause the caliper to cock during operation. this could cause the pads to wear at an angle A diagnostic trouble code is set for an open wheel speed sensor on the left front sensor. The technician measures the resistance at the sensor and finds it to be within specification. Which of the following is the most likely cause for the wheel speed sensor code? a. faulty ABS computer b. open fuse c. open wiring from the computer to the wheel speed sensor d. shorted left front ABS modulator valve - Answer C : open wiring from the computer to the wheel speed sensor why : an open in the wiring from the sensor to the computer would cause a diagnostic trouble code to be set and the sensor to have the correct resistance The brake warning lamp pictured above (pg. 56) stays on any time the ignition switch is on. Tech A says this could be caused by a poor ground at the parking brake switch. Tech B says this could be caused by a poor ground at the brake warning lamp switch. Who is correct? a. A only b. B only c. A & B d. neither A or B - Answer D : neither A or B why : neither technician is correct. there is a ground present at all times to cause the light to be on all the time Which of the following is true concerning the above caliper? ( pg. 57 ) a. this caliper incorporates the parking brake b. this caliper can only be used on the front c. this caliper can only be used with Type 5 brake fluid d. this caliper must be replaced at each brake pad replacement - Answer A : this caliper incorporates the parking brake why : ^^^ Tech A says a double flare line should be replaced with an ISO flare line. Tech B says an ISO flare line should be replaced with a double flare line. Who is correct? a. A only b. B only c. A & B d. neither - Answer D : neither why : neither technician is correct While testing the system shown above ( pg. 58 ), the technician finds there is no assist from the booster after the engine is shut off. Which of the following is the most likely correct? a. a faulty back-up EH pump b. a faulty accumulator c. a bypassing master cylinder d. a bypassing brake booster - Answer A : a faulty back-up EH pump why : the accumulator could be faulty and not storing pressure A customer is concerned that under heavy acceleration on dry pavement the traction control light comes on and the throttle momentarily becomes unresponsive. Which of the following is the most likely cause? a. a tire has lost traction b. the accelerator pedal position (APP) sensor is faulty c. the throttle position sensor (TPS) is faulty d. a wheel speed sensor is faulty - Answer A : a tire has lost traction why : when a tire loses traction the control module will reduce power from the engine in an attempt to regain traction. This can result in the customer sensing that the throttle is unresponsive A vehicle has a low brake pedal. Master cylinder fluid level is correct. Which of the following is the most likely cause? a. worn brake pad lining b. seized wheel cylinder c. seized caliper piston d. brake shoes out of adjustment - Answer D : brake shoes out of adjustment why : when the brake shoes are out of adjustment, the wheel cylinder must push them out further to contact the drum. the master cylinder will have to be pushed in further to accomplish this and will result in low pedal The brake caliper piston boot was cut when the caliper was reassembled. Tech A says this will cause a brake fluid leak when the caliper is reinstalled. Tech B says this could cause the piston to bind due to contamination. Who is correct? a. A only b. B only c. A & B d. neither - Answer B : B only why : Tech B is correct, the boot is designed to prevent contamination of the outside piston area. if the boot is ripped it could result i the piston becoming stuck A parking brake cable is binding on a vehicle with front disc and rear drum brakes. This can result in : a. dragging front brakes b. dragging rear brakes c. rusted brake drums d. rusted disc brake rotors - Answer B : dragging rear brakes why : the parking brakes are on the rear; therefore, a binding cable can cause a dragging rear brake Which of the following is LEAST LIKELY to be an input to the traction control system? a. throttle position sensor b. wheel speed sensor c. engine RPM d. transmission input shaft RPM - Answer D : transmission input shaft RPM why : the transmission input shaft is not a typical input to the traction control system