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An Anti-Lock Braking System (ABS)
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Air brakes
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An alternator
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Vermont CDL Permit Test - Air Brakes
(From the 2021 Vermont 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 answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Vermont Commercial Driver’s 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
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1.
What helps prevent wheel lockup when braking?
2.
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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3.
While operating on a downgrade, you should brake until you reach a speed that is:
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5 mph below your safe speed.
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10 mph below your safe speed.
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15 mph below your safe speed.
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4.
Air tank drains should:
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Only be used by mechanics.
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Only be used when it is wet outside.
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Be used to drain the tanks completely.
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5.
Having ABS on only one axle:
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Can be dangerous.
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Still allows you additional control when braking.
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Slows the vehicle, but cannot stop it.
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6.
A safety valve is set to open at ____ pounds per square inch (psi).
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100
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150
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200
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