PENNSYLVANIA CDL AIR BRAKES PRACTICE TEST
21.
Before driving a vehicle with a dual brake brake system, the driver should:
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wait at least 10 minutes before driving.
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wait at least 5 minutes before driving.
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pump the brake pedal 10 times to build pressure.
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allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
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22.
The safety relief valve is usually set to open at ____ psi.
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50
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75
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150
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100
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23.
The low air pressure warning light is usually:
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blue.
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red.
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orange.
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yellow.
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24.
Service brakes should:
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always be checked before applying the brakes.
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only be checked by a mechanic.
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be checked before each trip.
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All of the above.
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25.
During a trip you should check:
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mirrors.
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pressure gauges.
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temperature gauges.
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All of the above.
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