NH CDL AIR BRAKES PRACTICE TEST
11.
If your trailer starts to skid, you should:
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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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keep the rear of your vehicle close to the curb.
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accelerate slightly.
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12.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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10 to 20 psi
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50 to 75 psi
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100 to 120 psi
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20 to 45 psi
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13.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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high and low.
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left and right.
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normal and slippery.
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wet and dry.
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14.
The stop light switch:
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turns on the brake lights when you put on the air brakes.
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tells you when you need to use your parking brake instead of the service brake.
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should be used to fend off tailgaters.
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warns you when the air supply pressure drops below 55 psi.
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15.
If you must drive slowly, how should you alert following drivers?
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Turn on your taillights
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Use your emergency flashers if it is legal
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Help them out by signaling when it is safe to pass
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Flash your brake lights
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