問題一覧
1
What would a C-clamp be used for during disc brake service?
C. Retracting the piston in the bore
2
The red brake warning light illuminates when the brake pedal is depressed. Which of the following is the LEAST LIKELY cause?
D. Faulty ABS pump assembly
3
Which of the following would be considered the most normal brake fluid service interval?
B. 3 year/ 36,000 miles
4
The dimension stamp on a rotor is 1.18" (30.00mm). The left front rotor measures 1.17" (31.75mm). The right front rotor measures 1.29" (29.72). Which of the following is true?
A. The left rotor needs to be replaced.
5
The brake fluid in a vehicle is black. Which of the following is the most likely cause?
D. The brake fluid needs to be replaced with new.
6
Technican A says a 1/4" drill bit may be needed to check the parking brake adjustment on some vehicles. Technician B says a hose clamp can be used to release the parking brake cable from the backing plate. Who is correct?
C. Both A and B
7
The brake pedal vibrates when applied on a vehicle with a hydro-boost brake booster. Which of the following is the most likely cause?
B. A loose power steering pump belt
8
When bleeding the brakes using the brake pedal, which of the following is true?
A. A hose should be attached to the bleeder screw and submerged in brake fluid.
9
Technician A says the traction control system can signal the engine control module to reduce engine torque. Technician B says the traction control system can apply the vehicle brakes. Who is correct?
C. Both A and B
10
The specification stamped on the drum is 8.125" (206.38mm). Which measurement below would indicate a re-useable drum?
A. 8.025" (203.84mm)
11
The rear brakes tend to lock during hard braking. Which of the following could be the cause?
B. Proportioning valve
12
Which of the following best describes a four-wheel antilock (4WAL) antilock brake system?
D. It is a four-wheel antilock system used on a variety of vehicles.
13
Rotor runout is checked with a dial indicator and found to be out of specification. The rotor is removed, rotated 180 degrees, and reinstalled. The runout is checked again and is still out of specification. The excessive runout is in the same location on the hub. Which of the following is indicated?
C. The runout is in the hub.
14
Which of the following would cause a drum to have hard spots?
A. A broken return spring
15
When the brakes are applied at low speed on a slippery surface the front brakes lock. Which of the following could be the cause?
A. Metering valve
16
The parking brake warning light switch is misadjusted. Which light on the dash will most likely illuminate?
A. Red brake warning light
17
Which of the following is the correct disposal method for used brake fluid?
D. Save it in a separate container for recycling
18
Technician A says machining the rotor on the vehicle helps to compensate for hub runout. Technician B says machining the rotor on the vehicle helps to compensate for wheel runout. Who is correct?
A. A
19
Which of the following best describes a three channel ABS system?
A. The rear wheels share a circuit.
20
Technician A says DOT 5 brake fuid is clear. Technician B says DOT 3 brake fluid is purple. Who is correct?
D. Neither A nor B
21
Technician A says the red brake warning light is turned on by the parking brake warning light switch. Technician B says the red brake warning light is turned on by the pressure differential switch. Who is correct?
C. Both A and B
22
What is meant by "indexing" a rotor?
A. Matching the high spot on the rotor and low spot on the hub
23
On a vehicle with disc brakes, the outside pad is worn much more than the inside pad. Which of the following could be the cause?
A. Sticking caliper slides
24
After a brake application, the inlet pressure gauge drops to normal; however, the outlet pressure gauge remains higher than normal. Technician A says a faulty combination valve could be the cause. Technician B says a faulty antilock braking system (ABS) modulator valve could be the cause. Who is correct?
A. A
25
A parking brake drags after application and release. Technician A says the cable may be rusty. Technician B says the brake drum may be bell mouthed. Who is correct?
A. A
26
Technician A says some vacuum brake booster systems used on diesel engines will have an engine driven vacuum pump. Technician B says some vacuum brake booster systems used on gasoline engines will have an engine driven vacuum pump. Who is correct?
C. Both A and B
27
Which of the following tools would most likely be used to measure wheel bearing end-play?
C. Dial indicator
28
Which of the following would cause a grooved drum?
C. Missing brake shoe lining
29
Technicain A says excessive rotor runout can be caused by a warped disc brake rotor. Technician B says excessive rotor runout can be caused by hub runout. Who is correct?
C. Both A and B
30
When constant pressure is held on the brake pedal it will slowly fade to the floor. Which is the most likely cause?
D. Internally leaking master cylinder
31
The brake warning lamp pictured above stays on any time the ignition switch is on. Technician A says this could be caused by a stuck closed parking brake switch. Technician B says this could be caused by a stuck closed brake warning lamp switch. Who is correct?
C. Both A and B
32
The brake pedal is slow to return when released on a vehicle with a hydro-boost brake booster. Which of the following is the most likely cause?
B. A restricted booster return hose
33
Technician A says some disc brake rotors are directional and can be installed only on one side of a car. Technician B says rotor thickness variation and parallelism refer to the same measurement. Who is correct?
C. Both A and B
34
The wheels speed sensor is being checked with an ohmmeter. When the technician measures between one of the wires and chassis ground the ohmmeter shows 0.2 ohms. This indicates:
C. The sensor is shorted to chassis ground.
35
Technician A says the coil spring wrapped around a section of steel brake line is to help dissipate heat. Technician B says the spring wrapped around a section of steel brake line is to protect the line from abrasion wear. Who is correct?
В. В
36
Technician A says the RWAL system may be deactivated on some vehicles when they are put in four-wheel drive mode. Technician B says some G force sensors are checked by measuring resistance while tilting the sensor. Who is correct?
C. Both A and B
37
Refer to the illustration above. The parking brake works correctly; however, the brake does not operate when the service brake pedal is pushed. Technician A says the problem could be a stuck adjuster. Technician B says the problem could be a seized cam. Who is correct?
D. Neither A nor B
38
Rotor runout is checked with a dial indicator and found to be out of specification. The rotor is removed, rotated 180 degrees, and reinstalled. The runout is checked again and is still out of specification. The excessive runout is in the same location on the rotor. Which of the following is most likely indicated?
D. The runout is in the rotor.
39
Which of the following would be the most likely cause of an ABS code?
C. A cracked tone ring
40
Brake fluid is leaking from the master cylinder reservoir cap. The seal is swollen and deformed. Which of the following could be the cause?
B. Brake fluid contaminated with oil
41
Rotor runout is checked with a dial indicator and found to be out of specification. The rotor is removed, rotated 180 degrees, and reinstalled. The runout is checked again and found to be within specification. Which of the following is indicated?
C. The brake can be assembled in this position.
42
Which of the following is the hardest to remove from a drum with a drum brake lathe?
C. Hard spots
43
Technician A says the pin bushings are being installed in the illustration above. Technician B says the boot is being removed in the above illustration. Who is correct?
D. Neither A nor B
44
When replacing the master cylinder, which of the following is true?
D. The master cylinder should be bench bled prior to installation.
45
A technician is testing the accumulator on a hydro-boost brake booster. Which of the following is a correct test procedure?
C. Turn the engine off and apply the brakes.