DISTRICT OF COLUMBIA CDL AIR BRAKES PRACTICE TEST
21.
What is a dual air brake system?
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2 separate air brake systems: one system operates the front brakes, the other system operates the rear brakes.
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2 separate air brake systems: one system for daytime driving, the other system for nighttime driving.
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2 separate air brake systems: one system operates the left brakes, the other system operates the right brakes.
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None of the above.
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22.
If the air pressure gets too low:
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ABS will help maintain vehicle control.
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the brakes will not work.
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the brakes will lock up.
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you should set the parking brake.
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23.
Brake fade results from, and is affected by:
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excessive heat caused by not relying on the engine braking effect.
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brakes out of adjustment.
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excessive heat caused by using the brakes too much.
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All of the above.
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24.
Brakes out of adjustment can cause the other brakes to:
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last longer.
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work better.
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overheat and fade.
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apply more braking power.
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25.
Which of the following is TRUE about dual air brake systems?
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A dual air brake system has 2 separate air brake systems.
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Each brake system has its own air tanks, hoses and lines.
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most heavy-duty vehicles use dual air brake systems.
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All of the above.
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