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Drains the water and compressor oil from the air tanks.
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Prevents air from escaping if the air compressor has a leak.
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Activates the emergency brakes when there is a leak.
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Holds the spring brakes in position until they are used.
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North Dakota CDL Permit Test - Air Brakes
(From the 2021 North Dakota 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 four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the North Dakota Commercial Driver Guide. 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.
A one-way check valve:
2.
If one air system in a dual air brake system is very low on pressure:
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None of the brakes will work at all.
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Either the front or rear brakes will not be operating fully.
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There will be no noticeable affect.
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Lights on the outside of the tractor will flash.
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3.
The air entering air storage tanks may contain:
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Water and compressor oil.
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Frost.
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Gravel.
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Antifreeze.
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4.
During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.
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One half
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One quarter
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One third
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One tenth
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5.
Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.
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25 psi
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50 psi
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75 psi
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100 psi
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6.
If the low pressure warning light comes on while you are driving:
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Braking will only occur if there is enough air in the tanks.
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You can brake 14 times before the air in the system runs out.
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You should continue to drive normally and check the brake system when it is convenient.
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You should continue driving, but turn the emergency flashers on to warn other motorists.
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