CDL AIR BRAKES PRACTICE TEST - WISCONSIN
21.
Pressing and releasing the brake pedal unnecessarily can:
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let air out faster than the compressor can replace it.
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causes friction, which slows the vehicle.
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apply more air pressure.
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causes all the air to be lost.
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22.
Most heavy duty vehicles use ___ air brake systems for safety.
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reduced
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single
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dual
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triple
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23.
If the spring brakes do not release when you push the trailer air supply control, you should:
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check the air line connections.
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pump the brakes.
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rev or
lug the engine.
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check the electrical cables.
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24.
The most common type of brake is the:
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B-cam disc brake
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S-cam drum brake
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R-cam drum brake
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G-cam disc brake
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25.
Having ABS on only the trailer:
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makes the trailer more likely to roll over.
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makes the trailer more likely to swing out.
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still gives you more control over your vehicle during braking.
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is very dangerous.
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