CDL Air Brakes Practice Test - Utah
6.
Stepping on and off the brake pedal several times:
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may result in dangerously thin linings.
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may cause air leaks.
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reduces the air pressure in the tanks.
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All of the above.
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7.
You supply air to the trailer brake system by:
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pulling out the trailer air supply valve.
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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8.
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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1/5
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1/4
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1/3
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9.
Parking brakes are:
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not required on trailers.
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not required on buses.
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required on all vehicles.
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not required on commercial vehicles with air brakes.
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10.
Air pressure should build up in a single air system, within about:
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10 minutes.
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1 minute.
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3 minutes.
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15 minutes.
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