ALABAMA CDL AIR BRAKES PRACTICE TEST
21.
When the spring brakes are on, you should push the brake pedal down:
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Only when driving downhill.
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Only when driving uphill.
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Never.
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Only when approaching railroad-highway crossings.
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22.
With brake drums, if brakes become too hot:
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The brakes may stop working
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the air compressor will kick on to cool the brakes.
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the brakes will supply too much power to the drive wheels.
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your ABS will malfunction.
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23.
Supply pressure gauges tell you:
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when the air pressure in the tanks falls below 60 psi.
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how much pressure is in the air tanks.
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how much air pressure you are applying to the brakes.
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when the pressure in the system drops below 60 psi.
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24.
During a trip you should check:
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temperature gauges.
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pressure gauges.
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mirrors.
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All of the above.
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25.
The Johnson bar is a valve that:
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is installed in the first tank the air compressor pumps air to.
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keeps air from going out if the air compressor develops a leak.
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reduces the braking pressure to a safe level.
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works the trailer brakes.
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