Electronic Brake Control - Post
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
Correct Answer
C. Both Techs A and BExplanation
Both Techs A and B are correct. Tech A is correct in stating that the purpose of an anti-lock braking system is to prevent the wheels from locking during braking, especially on low-friction surfaces. This system allows the driver to maintain steering control while braking, reducing the risk of accidents. Tech B is also correct in stating that the anti-lock braking system does not guarantee that a vehicle can stop quickly on all road surfaces. Factors such as tire condition, road conditions, and vehicle weight also play a role in stopping distance.Rate this question:
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- 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
Correct Answer
C. Both A and BExplanation
When computer controlled, the switch sends the signal to the control module to turn on the brake lights.Rate this question:
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- 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
Correct Answer
C. Both A and BExplanation
The vehicle speed sensor and wheel speed sensor can be responsible for inputting vehicle speed to the electronic brake control module.Rate this question:
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- 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
Correct Answer
A. TrueExplanation
With ABS, most need a computer interface to access DTCs and other applicable data.Rate this question:
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- 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
Correct Answer
D. All of the aboveExplanation
All of these sensors are used with electronic stability control.Rate this question:
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- 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
Correct Answer
A. TrueExplanation
Most cars have a control button that can be used by the driver to disable traction control.Rate this question:
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- 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
Correct Answer
C. Both A and BExplanation
Both of these tools can be used in different applications to find various ABS related faults.Rate this question:
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- 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
Correct Answer
D. All of the aboveExplanation
A WSS can be tested electrically for each of the above, with a DVOM.Rate this question:
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- 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
Correct Answer
D. All of the aboveExplanation
Missing or damaged teeth in the pulse wheel will trigger an ABS fault.Rate this question:
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- 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
Correct Answer
A. TrueExplanation
The yellow/amber light is the color of light associated with ABS related faults.Rate this question:
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- 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
Correct Answer
C. Hydraulic control moduleExplanation
The hydraulic control module is part of the ABS unit/system.Rate this question:
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- 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
Correct Answer
D. All of the aboveExplanation
Control units can have anywhere between 2 and 4 channels.Rate this question:
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- 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
Correct Answer
B. Not serviceable in the fieldExplanation
We typically do not service a hydraulic unit. It is most often replaced.Rate this question:
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- 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
Correct Answer
A. TrueExplanation
Wheel speed sensors send a different frequency of pulse based upon vehicle speed.Rate this question:
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- 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
Correct Answer
B. FalseExplanation
This is true other than the metal plate. That is not part of the assembly.Rate this question:
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- 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
Correct Answer
B. Tech BExplanation
Some traction control systems will reduce engine power by limiting the fuel injector open time.Rate this question:
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- 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
Correct Answer
C. Both Techs A and BExplanation
Both of these tools can be used to test a wheel speed sensor.Rate this question:
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- 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
Correct Answer
C. Both Techs A and BExplanation
Retrieving DTC's should be your first step when there is a yellow/amber ABS warning light. The light will also warn you that there is something wrong that is monitoring by the ABS control module/Rate this question:
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- 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
Correct Answer
D. All of the aboveExplanation
All of the above are in the brake control module.Rate this question:
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- 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
Correct Answer
A. Crank sensorExplanation
The crank sensor is an input to the ECM and tells it the crank shaft's speed.Rate this question:
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- 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
Correct Answer
C. Both Techs A and BExplanation
Bleeding on most vehicles with ABS is just like bleeding in non-ABS vehicles, but if air does become trapped in the module, a scan tool will be needed to open the valves and push the fluid through.Rate this question:
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- 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
Correct Answer
B. DOT 5Explanation
DOT 5 fluid is not compatible with ABS modules.Rate this question:
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- 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
Correct Answer
C. Both Techs A and BExplanation
Self testing is performed every time the vehicle is turned off, then on. The ABS module will act as a proportioning valve in late model vehicles.Rate this question:
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- 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.
Correct Answer
D. Selecting a lower gear in the transmission.Explanation
The ABS module will not mess with the gearing of the transmission, but will do each of the others listed.Rate this question:
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- 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
Correct Answer
A. Tech AExplanation
There can be excessive resistance in the sensor's windings. Wheel speed sensors create the voltage, they are not supplied it.Rate this question:
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- 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
Correct Answer
C. Both Techs A and BExplanation
Some brake control modules can be programmed to the size of the vehicle's tires. Other applications may require replacing the module to match the module's programming to the installed tire size.Rate this question:
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- 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
Correct Answer
A. Star patternExplanation
Always use a star pattern to ensure the wheel is uniformly tightened to the hub.Rate this question:
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- 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
Correct Answer
B. Tech BExplanation
The push rod does not create hydraulic force. It is merely an intermediate component, responsible for transferring force to the remaining brake system.Rate this question:
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- 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
Correct Answer
C. Axle greaseExplanation
Axel grease is not used on braking components.Rate this question:
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- 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
Correct Answer
C. Both Techs A and BExplanation
Burnishing pads will help extend pad life and to reduce potential noise.Rate this question:
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- 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
Correct Answer
B. pH valueExplanation
Brake fluid is graded by the Department of Transportation based on its pH value. The pH value indicates the acidity or alkalinity of a substance. Brake fluid needs to have a specific pH level in order to maintain its effectiveness in the braking system. If the pH level is too high or too low, it can lead to corrosion and damage to the brake system components. Therefore, the Department of Transportation grades brake fluid based on its pH value to ensure that it meets the necessary standards for safe and efficient braking.Rate this question:
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- 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
Correct Answer
C. Doubled-walled steel lines and rubber hosesExplanation
Double-walled steel lines and rubber hoses are used to carry brake fluid from the master cylinder to the brake units. Double-walled steel lines are durable and provide strength and stability to the brake system, while rubber hoses are flexible and can absorb vibrations and movements. Combining both types of lines ensures a reliable and efficient brake fluid transfer, taking advantage of the strengths of each material.Rate this question:
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- 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
Correct Answer
C. Both Techs A and BExplanation
Both Techs A and B are correct. Proportioning valves do reduce brake pressure to the rear wheels, and they can be either pressure-sensitive or load-sensitive. Load-sensitive proportioning valves specifically adjust the rear brake pressure based on the weight of the vehicle's load. Therefore, both Techs A and B are providing accurate information about proportioning valves.Rate this question:
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- 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
Correct Answer
D. Neither Tech A nor BExplanation
Neither Tech A nor B is correct because using gasoline or kerosene to clean brake system components is not an approved method. Brake system components should be cleaned using specific brake cleaner products that are designed to effectively remove dirt, grease, and brake dust without causing damage to the components or compromising the braking system's performance. Using gasoline or kerosene can be dangerous as they are flammable substances and can leave behind residue that may affect the brake system's functionality.Rate this question:
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- 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
Correct Answer
B. Tech BExplanation
Tech B is correct. When replacing a brake master cylinder, it should be bench bled before it is placed into the vehicle's brake system. Bench bleeding helps remove any air trapped in the master cylinder before it is installed, ensuring proper brake system function. This is an important step to prevent spongy or ineffective brakes. Tech A's statement is incorrect because bleeding the master cylinder after it is placed in the vehicle's brake system would not effectively remove the air trapped in the cylinder.Rate this question:
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