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Compressed air
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Outside air
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Non-compressed air
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North Carolina CDL Permit Test - Air Brakes
(From the 2020 North Carolina CDL driver handbook)
| Number of questions: | 25 |
| Passing score: | 20 |
Directions:
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.
Passing grade —
5 or fewer errors
advertising
1.
What do air brakes use to make the brakes work?
2.
When a brake pedal is pressed and the S-cam is turned, the S-cam:
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Presses the brake shoes against the inside of the brake drum.
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Tightens the brake drum onto the axle.
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Presses the brake lining against the wheel.
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Releases air from the air tanks.
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3.
____ make up the emergency brake system.
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Only parts of the parking brake system
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Only parts of the service brake system
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Parts of the parking and service brake systems
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4.
What can happen if the air pressure gets too low in an air brake system?
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The brakes may squeak.
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The brakes may stop working.
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The brakes may be sluggish.
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5.
During an applied leakage test, the maximum leakage rate for a single vehicle with air brakes is:
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3 psi in one minute.
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6 psi in one minute.
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8 psi in one minute.
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4 psi in one minute.
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6.
On trucks and buses, where are ABS malfunction lamps located?
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On the driver’s door
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On the instrument panel
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On the outside of the vehicle by the passenger’s door
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Under the hood
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