VIRGINIA CDL AIR BRAKES PRACTICE TEST
6.
Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
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anti-lock brakes.
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a rear backup camera.
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hydraulic brakes.
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7.
What is the best way to test the low air pressure warning signal?
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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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step on and off the brake pedal while the engine is running.
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8.
You should NOT use the parking brakes if:
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the brakes are cold.
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the brakes are too dry.
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the brakes are very hot.
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9.
The supply pressure gauges tell you how much air pressure:
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you are applying to the brakes.
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is going to the brake chambers.
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is in the air tanks.
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10.
You supply air to the trailer brake system by:
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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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connecting the tractor service air line to the trailer service glad hand.
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