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The brakes will squeak.
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The brakes may freeze so the vehicle cannot move.
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The brakes may suddenly release by themselves.
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The brakes may become too smooth to be used.
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North Dakota CDL Permit Test - Air Brakes
(From the 2020 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.
What can happen if parking brakes are used in very wet weather with temperatures below freezing?
2.
How many air storage tanks are used in an air brake system?
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Two tanks
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Four tanks
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Six tanks
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The number varies.
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3.
In a dual air brake system, a leak in one system:
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Always means there are leaks in both systems.
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May not affect the other system.
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Is not something to worry about.
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Will also affect the other system.
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4.
When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:
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Slack adjuster.
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Axle.
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Brake drum.
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Alcohol evaporator.
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5.
Brake fading is caused when:
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Brakes are not used often enough.
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Brakes overheat.
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Brakes are too cold.
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Brakes are wet.
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6.
Air tank drains:
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Allow rain water to enter air tanks.
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Are used to drain water and oil from air tanks.
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Should never be opened.
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Must remain open while driving.
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