LA CDL AIR BRAKES PRACTICE TEST
6.
Foundation brakes are used:
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at each wheel.
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only with the rear wheels.
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only with the front wheels.
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only with the right wheels.
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7.
The safety relief valve is located:
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in the first tank the air compressor pumps air to.
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on the dashboard.
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on each end of the vehicle's axles.
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in the front brake.
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8.
The safety valve is usually set to open at:
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150 psi
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125 psi
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100 psi
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200 psi
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9.
Air tanks must be drained because:
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if one air system is low on pressure, the rear brakes will not be operating fully.
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when you push the brake pedal, air is let into each brake chamber.
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if you don't drain the tanks yourself, your battery fluid may drain out.
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compressed air usually has some water in it. The water can freeze in cold
weather and cause brake failure.
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10.
With brake drums, if brakes become too hot:
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the air compressor will kick on to cool the brakes.
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your ABS will malfunction.
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the brakes may stop working.
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the brakes will supply too much power to the drive wheels.
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