ASE A5 Brakes Practice Test
6. During a test drive, excessive vibration is felt in the steering wheel only when the brakes are applied. The front brake rotors have just been replaced for this same problem. Which of the following is MOST likely causing this vibration?
- A. Excessive lateral runout.
- B. Rusty hub flange.
- C. This is a normal condition.
- D. Excessive thickness variation.
Answer A is wrong. Excessive lateral runout will cause a vibration in the steering wheel. The importance of inspecting components like the hub flange can not be understated. Rust or debris on the flange results in front end vibration while braking.
Answer B is correct. Debris, rust or a bent hub flange will result in excessive front end vibration while braking.
Answer C is wrong. Vibration in the steering wheel is not a normal condition.
Answer D is wrong. Excessive thickness variation is not the most likely answer because the question indicates that new brake rotors have recently been installed.
7. A vehicle has a hard brake pedal at all times. Which of the following would cause this condition?
- A. A faulty vacuum brake booster.
- B. Leaking master cylinder cup seals.
- C. Air in the lines.
- D. High manifold vacuum.
Answer A is correct. A faulty vacuum booster will result in a hard brake pedal.
Answer B is wrong. Master cylinder cup seals cause the brake pedal to fade to the floor.
Answer C is wrong. Air bubbles in the brake lines result in a soft spongy pedal.
Answer D is wrong. A low manifold vacuum would deprive the vacuum assist unit of its vacuum source.
8. A vehicle nosedives while braking. Which of the following is MOST likely to cause this nosedive condition?
- A. The metering valve.
- B. The proportioning valve.
- C. Over-adjusted brakes.
- D. Both A and B
9. A vehicle has a growling sound that changes in pitch while turning. The noise is loudest during left-hand turns. Which of the following is causing this noise?
- A. A faulty LF wheel bearing.
- B. A faulty RF wheel bearing.
- C. A grabbing LF brake.
- D. A grabbing RF brake.
Answer A is wrong. Bearings make a grinding or growling noise that changes in pitch with vehicle speed.
Answer B is correct. The bearing on the outside of a turn is the loudest because it has more weight leaning on it.
Answer C is wrong. When a vehicle is turned left, more of the vehicle’s weight transfers to the right front wheel and vice versa.
Answer D is wrong. Answer B is correct.
10. A vehicle's TCS warning light flashes intermittently while driving in poor weather conditions. Technician A says this is normal. Technician B says if the ABS and traction control light illuminate continuously, scan the system for codes. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. A flashing TCS light is a normal response to slippery road conditions. It indicates that the system is activated and restoring traction to the wet or icy road surface.
Answer B is wrong. If the ABS and traction control light illuminate continuously, then the system should be scanned for codes.
Answer C is correct. Both technicians are correct.
Answer D is wrong. Most of these systems have a deactivation switch if traction control is not desired, for instance in deep snow.