ASE A5 Brakes Practice Test
21. A vehicle with a front disc, rear drum brake system skids, and nosedives when the brakes are first applied. Which of the following is causing this condition?
- A. The pressure differential switch.
- B. The metering valve.
- C. The proportioning valve.
- D. Aerated brake fluid.
Answer A is wrong. The pressure differential switch warns the driver of a possible hydraulic leak in the system.
Answer B is correct. The metering valve delays hydraulic pressure to the front brakes and gives the system a chance to overcome rear drum spring tension. The metering valve helps achieve balanced braking.
Answer C is wrong. A proportioning valve controls pressure to the rear brakes. It's used to prevent rear-wheel lockup.
Answer D is wrong. Aerated brake fluid causes a spongy pedal and affects the front and rear brakes.
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. If both the left and right side brake lights are out, start troubleshooting with a quick check of the circuit's fuse.
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 difference in pressure, 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 binds and is not releasing properly. Technician A the return spring may be damaged or sticking. Technician B says a rusty parking brake cable can bind and prevent parking brake application and release. 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. It's important to keep these systems adjusted to maintain proper parking brake tension and operation.
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. A brake drum inside micrometer is used to take this measurement.
Answer C is wrong. When measuring the inside of a brake drum, use the largest, not the smallest measurement.
Answer D is correct. Compare to the MAX "maximum diameter" stamped on the outside of the drum.