SD CDL AIR BRAKES PRACTICE TEST
6.
To perform an applied leakage test, the vehicle’s air pressure should be built up to maximum pressure. Check the air gauge to see that the air pressure should drop no more than:
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1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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7.
The Johnson bar is a valve that:
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keeps air from going out if the air compressor develops a leak.
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is installed in the first tank the air compressor pumps air to.
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reduces the braking pressure to a safe level.
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works the trailer brakes.
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8.
When the wheels of a trailer lock up:
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ABS will increase stopping power.
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the vehicle will gradually come to a complete stop.
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the trailer will tend to swing around.
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All of the above.
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9.
During a trip you should check:
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mirrors.
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temperature gauges.
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pressure gauges.
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All of the above.
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10.
If air doesn't flow all the way to the back:
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a rollover is more likely.
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the trailer will tend to swing around.
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your brakes will not work properly.
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your lower fifth wheel may fall off.
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