CDL Air Brakes Practice Test - Oregon
6.
The application pressure gauge:
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protects the tank and the rest of the system from too much pressure.
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stops the compressor from pumping air.
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shows how much air pressure is being applied to the brakes.
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tells you how much pressure is in the air tanks.
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7.
A dual air brake system:
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has a single air brake system, which uses two separate sets of brake controls.
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has two separate air brake systems, which use a single set of brake controls.
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has two separate air brake systems, which use two separate sets of brake controls.
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has a single air brake system, which uses a single set of brake controls.
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8.
Most hydraulic brake failures occur for one of two reasons, one of which is:
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driving in cold weather.
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relying too much on the engine braking effect.
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loss of hydraulic pressure.
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excessive downshifting.
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9.
To test the low pressure warning signal, you should:
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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 until the low air pressure warning signal comes on.
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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pump the brakes while your vehicle is running.
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manually let the air out of your brakes and see if the signal comes on.
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10.
When driving in very hot weather, the heat will increase the chances of:
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suspension system defects.
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ABS malfunction.
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tire failure.
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loss of hydraulic pressure.
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