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CDL Air Brakes Practice Test 2

By Dave Evangelisti / March 20, 2023

Time limit: 0

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Question 1 of 10

1. Question
What is the primary purpose of a front brake limiting valve?
- a. Improves the stopping ability of the vehicle
- b. Cuts the air pressure to the front brakes by half
- c. Detects road conditions and switches from slippery to normal as necessary
- d. Increases the stopping ability of the rear brakes
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Question 2 of 10

2. Question
Which of the following will affect the stopping power of spring brakes?
- a. Road conditions
- b. Proper adjustment
- c. Modulating control valve position (if equipped)
- d. All of the above
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Question 3 of 10

3. Question
A dual air brake system has which of the following features?
- a. Two sets of brake controls and two separate air brake systems
- b. One set of brake controls and two separate air brake systems
- c. Two sets of brake controls and one air brake system
- d. One set of brake controls and one air brake system
Correct

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Question 4 of 10

4. Question
Where are foundation brakes used?
- a. In emergency situations
- b. On front axles only
- c. On all wheels
- d. When parking
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Question 5 of 10

5. Question
Which of the following parts of the air brake systems should be checked during the pre-trip walk around inspection?
- a. Slack adjusters on S-cam brakes
- b. Air hoses connected to the brake chambers
- c. Brake discs or drums
- d. All of the above
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Question 6 of 10

6. Question
During inspection, if a slack adjuster moves less than about one inch where the push rod attaches to it, which of the following statements is true?
- a. It will fail roadside inspections
- b. It probably needs adjustment
- c. It has the appropriate amount of slack
- d. The vehicle will be very hard to stop
Correct

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Question 7 of 10

7. Question
When testing the air leakage rate (by turning off the engine and releasing the parking brake), what is an acceptable air loss rate?
- a. Less than 2 psi in one minute for single vehicles and less than 3 psi in one minute for combination vehicles.
- b. Less than 3 psi in one minute for both single and combination vehicles
- c. Less than 3 psi in one minute for single vehicles and less than 2 psi in one minute for combination vehicles.
- d. Less than 2 psi in one minute for both single and combination vehicles
Correct

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Question 8 of 10

8. Question
Which of the following is not a step in testing that the spring brakes come on automatically?
- a. Release parking brake
- b. Pump the brake pedal repeatedly
- c. Shut the engine off
- d. Pull out the parking brake control knob
Correct

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Question 9 of 10

9. Question
If you use controlled braking, which of the following is an acceptable procedure?
- a. If you need to turn, keep the brakes applied
- b. Apply the brakes all the way to lock the wheels
- c. Release the brakes if you need to make a large steering adjustment
- d. If your wheels start sliding, press the brake harder
Correct

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Question 10 of 10

10. Question
What should you do if the low air pressure warning light comes on?
- a. Stop and safely park your vehicle as quickly as possible
- b. Drive to the nearest service station
- c. Use stab braking until you are stopped
- d. No immediate action is required
Correct

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