DELAWARE CDL AIR BRAKES PRACTICE TEST
6.
With brake drums, if brakes become too hot:
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the air compressor will kick on to cool the brakes.
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the brakes may stop working.
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your ABS will malfunction.
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the brakes will supply too much power to the drive wheels.
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7.
The one-way check valve:
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keeps the axles in place.
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keeps air from going out if the air compressor develops a leak.
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keeps your wheels from locking up when you brake hard.
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supplies air to the trailer air tanks.
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8.
The air brake lag distance at 55 mph on dry pavement adds about:
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16 feet.
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75 feet.
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32 feet.
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60 feet.
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9.
The air compressor governor:
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controls when the air storage tanks will pump air into the air compressor.
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stops the compressor from pumping air.
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allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
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All of the above.
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10.
If the low pressure warning signal doesn't work:
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this could cause sudden emergency braking in a single-circuit air system.
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in dual systems the stopping distance will be decreased.
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you could lose air pressure and you would know it.
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None of the above.
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