ASE A5 Brakes Practice Test

41. A vehicle with a vacuum brake booster has a hard pedal with little stopping power. Technician A says a kink in the check valve's hose will result in this condition. Technician B says a vacuum booster needs at least 12 Hg of vacuum to operate properly. Who is correct?

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

41.

Answer A is correct. An inoperative brake booster, a faulty check valve or a kink in its hose will result in a hard brake pedal.

Answer B is wrong. A brake booster needs more vacuum, between 17-21 Hg to function properly.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

42. A vehicle has a low spongy brake pedal. Which of these is LEAST likely to result in this condition?

  • A. Loose wheel bearings.
  • B. Contaminated brake fluid.
  • C. Worn brake pads.
  • D. Air in the hydraulic system.

42.

Answer A is wrong. Loose wheel bearings will result in a low spongy brake pedal do to excessive movement.

Answer B is wrong. Contaminated brake fluid will result in this condition.

Answer C is correct. Low brake pads would result in a warning clip squeal or tire pad sensor light illumination.

Answer D is wrong. Air in the brake lines results in a spongy pedal.

43. Technician A says passive permanent magnet ABS wheel speed sensors produce an A/C voltage signal. Technician B says input from wheel speed sensors are used for anti-lock brake, electronic traction control, and electronic stability control systems. Who is correct?

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

43.

Answer A is wrong. The signal is sent to the electronic controller for anti-skid, stability, and traction control.

Answer B is wrong. The signal is sent to the electronic controller for (ABS) anti-lock brake, (TCS) traction control system, and (ESC) electronic stability control.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

44. The brakes of a four wheel disc brake system are self-applying and locking up after only a few miles of travel. Which of the following is the MOST likely cause of this condition?

  • A. A blocked master cylinder replenishing port.
  • B. A blocked master cylinder vent port.
  • C. Worn master cylinder cup seals.
  • D. Low intake manifold vacuum.

44.

Answer A is wrong. A blocked master cylinder replenishing port would result in vacuum forming behind the primary or secondary pistons.

Answer B is correct. Blocking the vent port can lead to pressure buildup and brake lockup. The vent or compensation port allows for the expansion of brake fluid. Brake fluid expands as brake fluid temperature rises from normal braking. If the port is blocked, excessive pressure will cause the brake units to self-apply.

Answer C is wrong. Worn master cylinder cup seals result in a fading or sinking brake pedal.

Answer D is wrong. Low intake manifold pressure will result in a hard brake pedal in a vacuum brake assist system.

45. A vehicle suffers from uneven pad wear. Technician A says to check for sticking slide pins. Technician B says this could be caused by a sticking caliper piston. Who is correct?

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

45.

Answer A is wrong. Sticking slide pins will result in uneven pad wear.

Answer B is wrong. A sticking caliper piston will result in uneven and excessive pad wear.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.