AK CDL AIR BRAKES PRACTICE TEST
21.
If your tires are hot, you should NOT:
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stop to let the tires cool down.
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let air out of the tires so the pressure goes back to normal.
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drive until you correct the cause of the overheating.
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22.
When you use your mirrors while driving on the road, you should:
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check them quickly.
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avoid checking them regularly.
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only use the driver's side mirror.
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23.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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You may not notice a major leak in the service line until you try to put the brakes on.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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24.
If you must make an emergency stop, you should:
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use the hand brake before the brake pedal.
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brake in a way that will keep your vehicle in a straight line.
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apply the brakes as hard as you can to lock them.
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25.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute after the initial pressure drop are:
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1 psi for single vehicles and 2 psi for a combination of 2 vehicles.
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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