WY CDL AIR BRAKES PRACTICE TEST
6.
Emergency brakes are:
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not required on commercial vehicles with air brakes.
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not required on buses.
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not required on doubles.
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required on all vehicles.
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7.
If air doesn't flow all the way to the back:
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your lower fifth wheel may fall off.
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a rollover is more likely.
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the trailer will tend to swing around.
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your brakes will not work properly.
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8.
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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pump the brakes until the air pressure drops below 45 psi.
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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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All of the above.
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9.
Before leaving your vehicle unattended, you should:
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Remove the keys.
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Chock the wheels.
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Apply the parking brake.
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All of the above.
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10.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/2
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1/4
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1/3
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1/5
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