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CDL Air Brakes Practice Test 5

By Dave Evangelisti / March 20, 2023

Time limit: 0

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Question 1 of 10

1. Question
Which of the following steps should you use to check the slack adjusters on S Cam brakes?
- a. Insure that the slack adjusters move more than 1 inch where the push rod attaches to it
- b. Put the parking brake on and pull on the slack adjuster
- c. Use gloves and pull hard on each slack adjuster
- d. Pull on the slack adjusters after draining the air from the system
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Question 2 of 10

2. Question
What is the typical air pressure of a fully charged air brake system?
- a. 85 psi
- b. 150 psi
- c. 100 psi
- d. 125 psi
Correct

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Question 3 of 10

3. Question
What is the proper way to test the air leakage rate?
- a. Turn off the engine and release the parking brake
- b. Fully charge the air system and leave the engine running
- c. Leave the engine running and release the parking brake
- d. Depress the brake pedal and monitor the air pressure gauge
Correct

Incorrect
Question 4 of 10

4. Question
What is stab braking?
- a. Applying the brakes as hard as possible without locking the wheels
- b. Using the parking brake to slow the vehicle in an emergency
- c. Applying your brakes until the wheels lock up, releasing, and then reapplying when the wheels start rolling
- d. Applying a constant light pressure on the brakes
Correct

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Question 5 of 10

5. Question
Why do air brakes take longer to stop than hydraulic brakes?
- a. The driver has an increased reaction time
- b. It takes longer for the air to flow through the lines
- c. The air compressor adds a delay
- d. All of the above
Correct

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Question 6 of 10

6. Question
What will happen if your air compressor stops?
- a. You will have an immediate loss of your brakes
- b. Your brakes will lock up
- c. You'll still have air pressure left in the air tanks to stop
- d. Your brakes will not be affected
Correct

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Question 7 of 10

7. Question
How should you check your air compressor governor “cut in” and “cut out” pressures?
- a. Run the engine at a fast idle
- b. Step on and off the brake to reduce tank pressure
- c. Monitor the air pressure gauge
- d. All of the above
Correct

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Question 8 of 10

8. Question
How fast should the air pressure build in a dual air system?
- a. From 50 to 90 psi in 3 minutes
- b. From 85 to 100 psi in 45 seconds
- c. From 70 to 125 psi in 60 seconds
- d. From 100 to 150 psi in 45 seconds
Correct

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Question 9 of 10

9. Question
What are the typical air compressor governor cut-in and cut-out pressures?
- a. Cut-in: 100 psi; Cut-out: 125 psi
- b. Cut-in: 60 psi; Cut-out: 125 psi
- c. Cut-in: 100 psi; Cut-out: 150 psi
- d. Cut-in: 90 psi; Cut-out: 125 psi
Correct

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Question 10 of 10

10. Question
What device will keep air in the tanks if the air compressor develops a leak?
- a. The tractor protection valve
- b. The one way check valve
- c. The safety valve
- d. The treadle valve
Correct

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