ASE A5 Brakes Practice Test

31. A hydro-boost brake system has reduced braking performance. Technician A says to check the power steering system. Technician B says to check the vacuum check valve. Who is correct?

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

31.

Answer A is correct. The power steering pump produces pressure for the Hydro-Boost unit.

Answer B is wrong. A vacuum check valve is used on a vacuum power booster.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

32. A vehicle with power assisted brakes has a hard brake pedal. Which of the following is LEAST likely to cause this condition.

  • A. Master cylinder.
  • B. Vacuum check valve.
  • C. Brake booster.
  • D. Low manifold vacuum.

32.

Answer A is correct. Faulty master cylinders do not typically result in a hard brake pedal. Actually it's more common for a faulty master cylinder to cause a low brake pedal that fades to the floor as it is applied. This is the least likely component listed to result in a hard brake pedal.

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

Answer C is wrong. A faulty brake booster 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 components of the vacuum assist brake system.

33. A vehicle pulls to the left only when the brakes are applied. This condition is MOST likely caused by:

  • 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.

33.

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. This is because after the pedal is released, hydraulic pressure remains on the caliper side of the restriction leaving the left brake unit partially engaged.

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.

34. Technician A says accumulators are found only on non-integral ABS systems. Technician B says some integral ABS units contain high pressure accumulators that must be discharged before repair. Who is correct?

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

34.

Answer A is wrong. Accumulators are found on integral and non-integral ABS systems.

Answer B is correct. High pressure units can be dangerous and must be discharged before removal. Always check with manufacturer's procedures before disassembling an ABS unit.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.

35. 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 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

35.

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.