AIR BRAKES CDL PRACTICE TEST - NORTH CAROLINA
21.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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35 psi
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100 psi
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150 psi
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50 psi
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22.
Emergency brakes must be held on by:
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hydraulic pressure.
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mechanical force.
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dynamic pressure.
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air pressure.
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23.
If the ABS is not working:
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you still have normal brake functions.
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the vehicle will have no brakes.
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the vehicle will have weak brakes.
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None of the above.
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24.
While driving, you should use your mirrors to:
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check the condition of the tires and cargo.
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check where the rear of your vehicle is while you make turns.
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know where other vehicles are around you.
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All of the above.
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25.
If your trailer starts to skid, you should:
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accelerate slightly.
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keep the rear of your vehicle close to the curb.
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release the brakes to get traction back.
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use the trailer hand brake (if you have one) to straighten out the rig.
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