1. What should happen before the air pressure in an air brake system tank falls below 55 psi?
The front lights should flash.
The vehicle will be unable to shift out of gear.
The warning light should activate.
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Air Brakes #2
This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the North Carolina Commercial Driver License Manual. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
Number of Questions
25
Passing Score
20
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To Pass
0
Correct
0
Incorrect
0
2. To confirm that a trailer has ABS, you can:
Look under the trailer for wheel speed sensors coming from the back of the brakes.
Look at the tires.
Look under the hood for the ABS sticker.
Remove a tire and look for the ABS sensor on the axle.
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4. In a dual air brake system, a leak in one system:
Always means there are leaks in both systems.
May not affect the other system.
Is not something to worry about.
Will also affect the other system.
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5. If the low pressure warning signal activates while you are driving, you should:
Put on your hazard lights and continue driving.
Exit the road and park as soon as safely possible.
Stop where you are and park.
Continue driving normally.
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7. What happens if the air pressure in a system’s air tanks falls below 60 psi?
A warning light will come on.
The vehicle should stop.
The front lights will flash.
The vehicle will not shift out of gear.
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