ASE A5 Brakes Practice Test

1. A pulsation is felt in the steering wheel only when the brakes are applied. Which of the following is most likely causing this condition?

  • A. An out-of-round tire.
  • B. Front rotor lateral runout.
  • C. A cupped tire.
  • D. Warped rear rotors.


Answer A is wrong. Use a dial indicator to measure lateral runout.

Answer B is correct. The pulsation caused by excessive front rotor runout is felt more in the steering wheel. Distorted or "warped" rear rotors are felt mostly in the seat.

Answer C is wrong. Answer B is correct.

Answer D is wrong. Answer B is correct.

2. The traction control and stability control systems require input from which of the following sensors?

  • A. Yaw Rate Sensor
  • B. Steering Angle Sensor
  • C. Wheel Speed Sensor
  • D. All of the above.


Answer A is wrong. The Yaw Rate sensor senses vehicle rotational speed around its vertical axis and informs the system when a vehicle is about to fishtail or roll sideways.

Answer B is wrong. The SAS Steering Angle sensor indicates the turning angle of the steering wheel.

Answer C is wrong. The wheel speed sensors indicate wheel speed to the control module.

Answer D is correct. They are sensor inputs for the ESP electronic stability program.

3. Which of the following lubricants are used to lubricate rubber brake components while performing a brake job?

  • A. High Temperature Silicon-based Lubricant
  • B. Petroleum-based Lubricant
  • C. Both A and B
  • D. Neither A or B


Answer A is correct. Use a high-temperature silicon-based lubricant that does not contain petroleum.

Answer B is wrong. Petroleum-based products can cause swelling, causing problems with rubber boots and bushings that result in sticking brake caliper slide pins.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

4. A technician inspects the brakes on a vehicle with four-wheel disc brakes and a vacuum assist brake booster. After pumping the brake pedal several times, the technician starts the engine. The pedal drops about ¼ of an inch toward the floor. Which of the following statements is correct?

  • A. This is normal.
  • B. The brake booster is faulty.
  • C. The master cylinder is faulty.
  • D. There is air in the brake system.


Answer A is correct. This result is normal.

Answer B is wrong. Typically, a loss of vacuum or a faulty brake booster results in a hard brake pedal.

Answer C is wrong. A faulty master cylinder is different and usually has an internal (cup seal) leak, producing a soft brake pedal that fades to the floor.

Answer D is wrong. Air in the system results in a soft brake pedal.

5. A customer states the TCS traction control system's warning light sometimes flashes while accelerating from a stoplight. Technician A says the TCS system controls wheel spin while accelerating on slippery surfaces. Technician B says it is normal for the warning light to flash when the system is active. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B


Answer A is wrong. The TCS traction control system controls wheel slip and loss of traction during hard and sudden acceleration by reducing engine speed or applying individual brake units.

Answer B is wrong. A flashing TCS light is a normal response to slippery road conditions. It indicates the system is activated and restoring traction to the wet or icy road surface.

Answer C is correct. Both technicians are correct.

Answer D is wrong. If the ABS and traction control light illuminate continuously, the system should be inspected and scanned for codes.