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Chapter 35
- 1.Tech A says that the purpose of an anti-lock braking system is to prevent the wheels from locking during braking, especially on low-friction surfaces such as wet, icy, or snowy roads. Tech B says that the anti-lock braking system does not mean a vehicle can stop quickly on all road surfaces. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 2.The brake switch sends an electronic signal to which of the following?
- A.
Brake lights
- B.
Electronic brake control module
- C.
Both A and B
- D.
None of the above
- 3.Which of the following typically reports the vehicle's speed to the electronic brake control module?
- A.
Wheel speed sensor
- B.
Vehicle speed sensor
- C.
Both A and B
- D.
None of the above
- 4.True or False. Some anti-lock braking systems require a scan tool that connects to the electronic brake control module or power train control module to read the fault codes.
- A.
True
- B.
False
- 5.Which of the following is a typical sensor used by the electronic stability control system?
- A.
Yaw sensor
- B.
Steering angle sensor
- C.
Roll-rate sensor
- D.
All of the above
- 6.True or False. Some traction control systems can be temporarily deactivated by a traction control system function switch located on the dash or center console.
- A.
True
- B.
False
- 7.Which of the following is used to diagnose an anti-lock braking system fault?
- A.
DVOM
- B.
Oscilloscope
- C.
Both A and B
- D.
None of the above
- 8.Wheel speed sensors should be checked for which of the following with a DVOM?
- A.
Open
- B.
Ground
- C.
High resistance
- D.
All of the above
- 9.The tone wheel used on an anti-lock braking system's wheel speed sensors should be checked for which of the following?
- A.
Broken teeth
- B.
Damaged teeth
- C.
Missing teeth
- D.
All of the above
- 10.True or False. On a vehicle with an electronic brake control module, if the yellow warning lamp is not illuminated and the brakes are not functioning properly, suspect a problem that is not monitored by the electronic brake control module.
- A.
True
- B.
False
- 11.Which of the following modules executes the commands of the anti-lock braking system control module?
- A.
Power train control module
- B.
Transmission control module
- C.
Hydraulic control module
- D.
None of the above
- 12.Typical hydraulic control units for electronic brake control systems can have how many channels?
- A.
Two
- B.
Three
- C.
Four
- D.
All of the above
- 13.If there is a fault with the hydraulic control unit, typically the unit is which of the following?
- A.
Serviceable in the field
- B.
Not serviceable in the field
- C.
Both A and B
- D.
None of the above
- 14.True or False. Wheel speed sensors send electric signals to the electronic brake control module to determine speed and rate of deceleration of each wheel.
- A.
True
- B.
False
- 15.True or False. Wheel sensor assemblies are comprised of a toothed tone wheel and a pick-up assembly, separated by a metal plate.
- A.
True
- B.
False
- 16.Tech A says that all traction control systems apply the brakes as a first step and reduce engine power. Tech B says that some traction control systems do not apply the brakes as a first step but reduce engine power. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 17.Tech A says that wheel speed senor operation can be tested with a DVOM. Tech B says that wheel speed senor operation can be checked with an oscilloscope. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 18.Tech A says that if the yellow warning lamp is illuminated indicating a fault in the electronic brake control system, you should retrieve the diagnostic trouble codes and follow the procedure listed in the service information. Tech B says that if the yellow warning lamp is not illuminated and the brakes are not functioning properly on a vehicle with an electronic brake control system, you should suspect a problem that is not monitored by the electronic brake control module. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 19.Which of the following is MOST likely to be in an electronic brake control module?
- A.
Electronic circuitry
- B.
Computer memory
- C.
Output drivers
- D.
All of the above
- 20.Which of the following is LEAST likely to be an input to an electronic brake control module?
- A.
Crank sensor
- B.
Ignition switch
- C.
Battery
- D.
All of the above
- 21.Tech A says that bleeding an electronic brake control system is just like bleeding a non–electronic brake control system. Tech B says that if air is allowed into the electronic brake control system, it can become trapped in the hydraulic control unit, requiring a scan tool to operate the solenoid valves to help bleed the air from the electronic brake control system. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 22.Which brake fluid is LEAST likely to be used in an electronic brake control system?
- A.
DOT 4
- B.
DOT 5
- C.
Both A and B
- D.
None of the above
- 23.Tech A says that some anti-lock braking systems do away with the mechanical proportioning valve. Tech B says that the electronic brake control module performs an automatic self-check and warning lamp bulb check on the anti-lock braking system every time the key is turned to the “run” position. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 24.All of the following are typical methods of reducing power in the vehicle when the electronic brake control module requests reduced power, EXCEPT:
- A.
Reducing the throttle plate opening.
- B.
Shutting down one or more injectors.
- C.
Reducing the engine timing.
- D.
Selecting a lower gear in the transmission.
- 25.Tech A says that a typical wheel speed sensor can be faulty due to a sensor resistance problem. Tech B says that a typical wheel speed sensor could be faulty due to no voltage supply. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 26.Tech A says that in some cases, the electronic brake control module can be programmed with a new tire size to restore proper electronic brake control performance. Tech B says that there could be an electronic brake control module available for installation that matches a new tire size. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 27.Once all of the lug nuts have been torqued, go around them again, this time in a _______________ to ensure that you did not miss any in the previous pattern.
- A.
Star pattern
- B.
Circular pattern
- C.
Alternating pattern
- D.
None of the above
- 28.Tech A says that when the brake pedal is depressed, a push rod creates the hydraulic pressure in the disc brake system. Tech B says that when the brake pedal is depressed, a push rod transfers the force through a brake booster to a hydraulic master cylinder. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 29.Which of the following is/are LEAST likely to be used to reduce disc brake squeal?
- A.
Shims
- B.
Spacers
- C.
Axle grease
- D.
Bendable tangs
- 30.Tech A says that burnishing the new brake pads results in longer brake pad life. Tech B says that burnishing the new brake pads results in quiet brake life. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 31.Brake fluid is graded by the Department of Transportation on which of the following?
- A.
Color
- B.
PH value
- C.
How much water it can hold
- D.
All of the above
- 32.___________________ carry brake fluid from the master cylinder to the brake units.
- A.
Double-walled steel lines only
- B.
Rubber hoses only
- C.
Doubled-walled steel lines and rubber hoses
- D.
None of the above
- 33.Tech A says that proportioning valves reduce brake pressure to the rear wheels and are pressure-sensitive or load-sensitive. Tech B says that load-sensitive proportioning valves adjust rear brake pressure according to the weight of the vehicle's load. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 34.Tech A says that using gasoline is an approved method of cleaning brake system components. Tech B says that using kerosene is an approved method of cleaning brake system components. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 35.Tech A says that when replacing a brake master cylinder, it should be bled after placing the master cylinder into the vehicle's brake system. Tech B says that when replacing a master cylinder, it should be bench bled before the master cylinder is placed into the vehicle's brake system. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
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