ASE A5 Brakes Practice Test
1. During a test drive the technician notices an excessive vibration in the steering wheel only when the brakes are applied. The front brake rotors have just been replaced for this same vibration. Which of these is MOST likely the cause of this condition.
- 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 certainly cause the vibration in the steering. The importance of inspecting components like the hub flange can not be understated. Rust or debris on the flange will result 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. This is not a normal condition.
Answer D is wrong. Excessive thickness variation is not the most likely answer. The question indicates new brake rotors.
2. The red brake warning light is illuminated on the instrument panel of a vehicle with four wheel disc brakes. Which of these is LEAST likely to cause this warning light to illuminate.
- A. Low brake fluid level.
- B. Unequal brake fluid pressure.
- C. Grounded parking brake circuit.
- D. Loose wheel speed sensor plug.
Answer A is wrong. This will illuminate the red brake light. Inspect the brake fluid level and the reservoir cap when the red warning light is illuminated.
Answer B is wrong. Unequal fluid pressure will move the pressure differential switch illuminating the red brake warning light.
Answer C is wrong. The red warning light indicates a problem with the hydraulic system or parking brake engagement.
Answer D is correct. Answer D is correct because this is the only answer that would illuminate the amber warning light instead of the red brake warning light.
3. The right brake light is inoperative when the brake pedal is depressed. All the other lights function properly. Which of the following should be inspected when diagnosing this inoperative brake light circuit?
- A. The right rear bulb socket.
- B. The right rear bulb.
- C. The brake light fuse.
- D. Both A and B
Answer A is wrong. Only because both answers A and B are correct. Check the bulb and the socket for proper fit and operation.
Answer B is wrong. The right rear bulb and socket should be inspected.
Answer C is wrong. The fuse protects the entire circuit. The left brake light circuit would also be inoperative if the fuse was loose or blown.
Answer D is correct. Both A and B are correct. Check the socket and the bulb for operation and resistance.
4. After installation of brake pads, the pad manufacturer recommends performing a burnishing procedure. Technician A says this is accomplished by repeating several high speed stops. Technician B says this process includes light application of the brake pedal and a brief cool down period between stops. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. Technician B is correct. The procedure involves easy stops from 30 mph not hard stops from 55 mph.
Answer B is correct. The burnishing or break in procedure cures the friction materials in the pads. It provides for better braking performance.
Answer C is wrong. Technician B is correct.
Answer D is wrong. Technician B is correct.
5. The red brake warning light on the instrument panel illuminates only when the brakes are applied. Which of the following results in this condition.
- A. A burned brake light bulb.
- B. Air in the hydraulic brake system.
- C. A damaged wheel speed sensor tone ring.
- D. An open in the brake switch circuit.
Answer A is wrong. Some vehicles have a brake light failure indicator. This is typically amber. A burned brake light bulb will not illuminate the red brake warning light.
Answer B is correct. The red brake warning light will illuminate if there's a loss in pressure in one of the two hydraulic brake circuits, if the parking brake is engaged, or if the key is in the ON/RUN position.
Answer C is wrong. If the ABS controller senses a damaged tone ring by an erratic wheel speed sensor signal, it will illuminate the amber ABS light.
Answer D is wrong. The brake lights would not illuminate if there's an open in the brake switch.