AIR BRAKES CDL PRACTICE TEST - WASHINGTON
21.
Having ABS on only the trailer:
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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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22.
The tractor protection valve:
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provides the air supply for the brake system.
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will close automatically if the air pressure drops to a certain level.
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All of the above.
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23.
If a load is placed on one side of the trailer:
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a rollover is more likely.
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the steering axle weight will be too light to steer safely.
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making turns may be easier.
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24.
If your brakes fail while you are driving on a downgrade, you should:
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use an escape ramp if it's available.
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take the least hazardous escape route you can.
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All of the above.
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25.
The posted speed limit:
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may only be exceeded when driving in rural areas.
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should only be exceeded when passing other vehicles.
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should never be exceeded.
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