KENTUCKY CDL AIR BRAKES PRACTICE TEST
16.
If the low pressure warning signal doesn't work:
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you could lose air pressure and you would know it.
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in dual systems the stopping distance will be decreased.
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this could cause sudden emergency braking in a single-circuit air system.
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None of the above.
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17.
Most heavy-duty vehicles use:
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air brakes.
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pressure brakes.
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solid brakes.
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hydraulic brakes.
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18.
Why must air tanks be drained?
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Water and
oil reduce the air pressure.
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The low boiling point of water reduces braking power.
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To keep from fouling the air compressor oil.
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Water can freeze in cold weather and cause brake failure.
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19.
In a dual air brake system, if one air system is very low on pressure:
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either the front or rear brakes will not be operating fully.
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you should drive and brake as you always have.
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you should pump the brakes to restore pressure.
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the effect won't be noticeable for the first 50 miles.
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20.
If the safety relief valve in the air brake system releases air:
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this will supply more power to the brakes.
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this will supply more power to the drive wheels.
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something is wrong.
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the valve is fully operational.
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