SD CDL AIR BRAKES PRACTICE TEST
21.
Do NOT use the parking brakes:
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if the brakes are very hot.
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when you park for less than two hours.
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when you leave your vehicle.
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to test that they work.
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22.
Front-end header boards:
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protect drivers from spilled cargo.
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protect drivers from cargo in case of an accident or emergency stop.
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should never be used.
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reduce traction.
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23.
The one-way check valve:
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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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keeps the axles in place.
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supplies air to the trailer air tanks.
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24.
When driving in hot weather, drivers should inspect tires:
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every 2 hours or every 100 miles.
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every 4 hours or every 200 miles.
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every 3 hours or every 75 miles.
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every hour or every 50 miles.
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25.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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less; more
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greater; more
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less; less
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greater; less
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