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Slack adjuster
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One-way check valve
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Tractor protection valve
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New Mexico CDL Permit Test - Air Brakes
(From the 2021 New Mexico 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 New Mexico 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.
The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
2.
Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:
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Are necessary for the proper function of the system.
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Should take up about 10 percent of the tank.
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Should be removed regularly.
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3.
You should test the low pressure warning signal by:
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Turning on the engine and applying the trailer hand brake.
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Rapidly pressing and releasing the brake pedal.
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Removing wheel chocks and disengaging the parking brake.
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4.
When leaving your vehicle unattended:
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The parking brake must be always be used.
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The parking brake should never be used.
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Windows in the cab should be lowered.
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5.
An emergency brake must be controlled by:
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Mechanical force.
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Air pressure.
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Gravity.
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6.
In a vehicle with dual air brakes, a leak in one system ____ the second system.
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Will always affect
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May not affect
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Is caused by
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