AIR BRAKES CDL PRACTICE TEST - ALASKA
6.
The one-way check valve:
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supplies air to the trailer air tanks.
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keeps your wheels from locking up when you brake hard.
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keeps air from going out if the air compressor develops a leak.
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7.
Having ABS on only the trailer:
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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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makes the trailer more likely to swing out.
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8.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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All of the above.
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9.
The trailer hand valve should:
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never be used for parking.
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be used in driving.
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never be used to test the trailer brakes.
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10.
Older trailers do not have spring brakes. If the air supply leaks away:
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the trailer will stop normally.
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there will be no emergency brakes.
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the ABS won't work properly.
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