CDL AIR BRAKES PRACTICE TEST - MISSISSIPPI
21.
Service brakes should:
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always be checked before applying the brakes.
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be checked before each trip.
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only be checked by a mechanic.
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All of the above.
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22.
You supply air to the trailer brake system by:
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pushing in the trailer air supply knob.
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plugging the electrical cord into the trailer.
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connecting the tractor service air line to the trailer service glad hand.
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pulling out the trailer air supply valve.
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23.
What is the best way to test the low air pressure warning signal?
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step on and off the brake pedal while the engine is running.
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Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
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pump the brakes until the air pressure drops below 45 psi.
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All of the above.
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24.
If the low air pressure warning light comes on, you should:
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continue to drive normally.
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call for help.
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set the parking brake.
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stop immediately.
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25.
On front tires, tread should be at least:
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1/16 inch
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4/16 inch
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4/32 inch
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2/32 inch
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