ASE A5 Brakes Practice Test
21. The brake pads on the left front disc brake are wearing unevenly. The inside brake pad has worn more than the outside pad. Which of these could be the cause?
- A. Seized caliper guide pins.
- B. Sticking caliper piston.
- C. Both A and B
- D. Neither A or B
Answer A is wrong. Seized and sticking caliper slide pins result in uneven brake pad wear.
Answer B is wrong. A sticking caliper piston causes brake drag and inside brake pad wear.
Answer C is correct. Sticking and seized guide pins, sticking and seized caliper pistons, brake pad misalignment, and disc thickness variation result in premature wear.
Answer D is wrong. Both A and B are correct.
22. The right side brake light is inoperative and does not illuminate. All of the other lights are functioning normally. Which of the following is causing this condition?
- A. A burned stop light fuse.
- B. An open pressure differential switch.
- C. An open brake switch.
- D. A burned bulb.
Answer A is wrong. Check the circuit's fuse if both the left and right side brake lights are out.
Answer B is wrong. The pressure differential switch is used to inform the driver if there is a leak in the system. It is used in dual master cylinders to detect a difference in pressure between the two sides. If there is a pressure difference, the switch will complete the circuit and illuminate the red brake warning indicator lamp.
Answer C is wrong. A stuck closed brake switch completes the circuit. It results in brake light illumination at all times, even without pressing the pedal. A stuck open brake switch results in no brake light illumination.
Answer D is correct. Check the right side bulb first. Most of the time, it's apparent the bulb has burned by the discoloring inside the bulb.
23. A vehicle with an integral parking brake system is binding and not fully releasing. Technician A says the return spring may be damaged or sticking. Technician B says a rusty parking brake cable will result in this condition. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. A damaged or missing return spring will keep the shoes from returning to rest correctly.
Answer B is wrong. A binding or misadjusted parking brake cable can prevent application and release.
Answer C is correct. Both technicians are correct.
Answer D is wrong. You'll also find that many strut bars have star adjusters incorporated. Adjusting these systems to maintain proper parking brake tension and operation is important.
24. Caliper-integrated EPB parking brakes have all of the following EXCEPT:
- A. A parking brake switch.
- B. An electronic control unit.
- C. A caliper-mounted actuator.
- D. A hand-operated lever.
Answer A is wrong. There are two types of Electric Parking Brakes. They both have a switch in the passenger's compartment. Cable-puller EPB parking brakes use cables that can stretch and require periodic checks and adjustments. Caliper-integrated EPB parking brakes have actuators/motors fastened to the brake caliper and have no cables to rust or adjust.
Answer B is wrong. An electronic control unit receives inputs and operates the electric motors.
Answer C is wrong. The motor is part of the caliper. Check for special procedures. Electric parking brakes require a manufacturer-specific process before brake pad replacement. It depends on the vehicle. Typically, a scan tool places the system in service or maintenance mode before replacing the pads.
Answer D is correct. A manual lever or handle and a brake cable activate conventional parking brake systems.
25. After measuring the inside diameter of a brake drum with a brake drum micrometer, the technician should use which of the following measurements?
- A. The average of all the measurements.
- B. A brake drum micrometer is not used.
- C. The smallest measurement.
- D. The largest measurement.
Answer A is wrong. When measuring the inside diameter of a brake drum, use the largest measurement recorded.
Answer B is wrong. Use a brake drum micrometer or caliper to measure the inside diameter of a brake drum.
Answer C is wrong. They can become out of round or wear beyond the maximum discard specifications.
Answer D is correct. Retrieve the MAX "maximum diameter" stamped on the outside of the drum. Compare it to the largest measurement recorded.