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Slack adjuster
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|
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One-way check valve
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|
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Tractor protection valve
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California CDL Permit Test - Air Brakes
(From the 2021 California 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 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 California Commercial Driver Handbook. Questions come from chapters 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.
The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
2.
A visual low pressure warning signal should activate before air pressure drops to a level between:
|
55 and 75 psi.
|
|
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35 and 50 psi.
|
|
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75 and 100 psi.
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3.
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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|
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Tightens the brake drum onto the axle.
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|
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Presses the brake lining against the wheel.
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4.
If the low pressure warning signal activates while you are driving, you should:
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Continue driving normally.
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|
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Exit the road and park as soon as safely possible.
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|
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Stop where you are and park.
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5.
During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?
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3 psi in one minute.
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|
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6 psi in one minute.
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|
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8 psi in one minute.
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6.
During an applied leakage test, the maximum leakage rate for a triple combination vehicle is:
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10 psi in a minute.
|
|
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8 psi in a minute.
|
|
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6 psi in a minute.
|
|
|
4 psi in a minute.
|
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