AIR BRAKES CDL PRACTICE TEST - MAINE
16.
The parking or emergency brakes of trucks or buses must be held on by:
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air pressure.
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fluid pressure.
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spring pressure.
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17.
The safety relief valve is located:
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in the front brake.
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on each end of the vehicle's axles.
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in the first tank the air compressor pumps air to.
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18.
If the air pressure gets too low:
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the brakes will not work.
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ABS will help maintain vehicle control.
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the brakes will lock up.
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19.
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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works the trailer brakes.
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reduces the braking pressure to a safe level.
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20.
When using a fire extinguisher, you should stay:
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as far away from the fire as possible.
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as close to the fire as possible, without getting burnt.
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at least 10 feet away from the fire.
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