ASE A5 Brakes Practice Test

46. A vehicle with a Hydroboost brake system has reduced braking performance. Which of the these could be the cause?

  • A. Low manifold vacuum.
  • B. A faulty vacuum check valve.
  • C. A clogged inlet valve.
  • D. A faulty power steering pump.

46.

Answer A is wrong. Hydroboost brake units use power steering pressure instead of engine vacuum for brake assist.

Answer B is wrong. The vacuum check valve controls the flow of vacuum to a vacuum power booster.

Answer C is wrong. A clogged inlet valve blocks or slows the airflow into a vacuum booster.

Answer D is correct. The power steering pump produces pressure for the Hydroboost brake assist unit.

47. A vehicle with a vacuum booster has a hard brake pedal. Which of the following is LEAST likely to cause this condition?

  • A. The master cylinder.
  • B. The vacuum check valve.
  • C. A clogged check valve hose.
  • D. Low manifold vacuum.

47.

Answer A is correct. Faulty master cylinders do not typically result in a hard brake pedal. It is more common for a faulty master cylinder to cause a low brake pedal that fades to the floor.

Answer B is wrong. A faulty vacuum check valve will result in a hard brake pedal.

Answer C is wrong. A clogged check valve hose will result in a hard brake pedal.

Answer D is wrong. Low intake manifold pressure will result in a hard brake pedal. Answers B, C, and D are all parts of the vacuum assist brake system.

48. A vehicle pulls to the left only when the brakes are applied. Which of the these could be the cause?

  • A. A seized left front caliper.
  • B. A restriction in the left front brake line.
  • C. Leaking master cylinder cup seals.
  • D. A seized right front caliper.

48.

Answer A is wrong. A frozen left front caliper will cause the vehicle to pull to the right when braking.

Answer B is wrong. A restriction in the left front brake line will cause the left front brake to drag after the brakes are released.

Answer C is wrong. Leaking master cylinder cup seals result in an internal leak causing a loss in pressure and the pedal to fade to the floor when braking.

Answer D is correct. A frozen right front caliper will cause the vehicle to pull to the left when braking.

49. All of the following statements are correct about brake shoe replacement EXCEPT:

  • A. The primary shoe faces the front of the vehicle.
  • B. The secondary shoe has a shorter brake shoe lining.
  • C. The secondary shoe faces the rear of the vehicle.
  • D. Shoe lining can be riveted or glued to the shoe.

49.

Answer A is wrong. The primary shoe faces the front of the vehicle.

Answer B is correct. The shoe with the shorter lining (the primary shoe) faces the front of the vehicle.

Answer C is wrong. The secondary shoe faces the rear of the vehicle.

Answer D is wrong. Shoe lining can be riveted or glued to the shoe.

50. Technician A says ABS control units are programmed to ignore speed sensor input variations below a certain threshold. Technician B says a one-channel ABS brake system controls hydraulic pressure to the rear brake units. Who is correct?

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

50

Answer A is wrong. Minor variations in speed sensor input are not acted upon by the system.

Answer B is wrong. These systems use one sensor to control the two rear wheels.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.