CDL AIR BRAKES PRACTICE TEST - NEW MEXICO
16.
Which of the following is not a type of retarder?
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Exhaust
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Hydraulic
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Pressure
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17.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/4
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1/2
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1/3
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18.
The wig wag is:
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a type of rollover.
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a low air pressure warning system.
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a noise reduction mechanism.
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19.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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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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You may not notice a major leak in the service line until you try to put the brakes on.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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20.
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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