AIR BRAKES PRACTICE TEST - VIRGINIA
16.
An alcohol evaporator:
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protects the air brake system from too much pressure.
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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used to reduce the chance of the front wheels skidding.
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17.
Most heavy vehicles require ________ change gears.
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double clutching
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single clutching
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double shifting
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18.
Typically an air system is fully-charged at:
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75 psi
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25 psi
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125 psi
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19.
Pressing and releasing the brake pedal unnecessarily can:
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let air out faster than the compressor can replace it.
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causes friction, which slows the vehicle.
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apply more air pressure.
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20.
In a dual air brake system, if one air system is very low on pressure:
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you should pump the brakes to restore 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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