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
17. A dual air brake system:
Has two separate air brake systems, but uses a single set of controls.
Has one air brake system for each side of the truck.
Has two brakes for each wheel.
Has a single air brake system, but uses two sets of controls.
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18. If the low pressure warning light comes on while you are driving:
Braking will only occur if there is enough air in the tanks.
You should continue driving, but turn the emergency flashers on to warn other motorists.
You should continue to drive normally and check the brake system when it is convenient.
You can brake 14 times before the air in the system runs out.
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19. When leaving a vehicle unattended, a driver should:
Deflate the tires by 10 percent.
Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
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20. When traveling down a steep downgrade:
The vehicle should be placed in a low gear and the driver should use engine braking.
The driver should continually downshift instead of using the brakes.
The air brakes should be used.
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21. Why should you regularly drain the air tanks?
Because compressed air contains some water and the water collects in the tanks
Because the air gets old and needs to be replaced
To allow for a change in pressure
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