LA CDL AIR BRAKES PRACTICE TEST
21.
Why must air tanks be drained?
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The alcohol evaporator might stop working.
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The water can freeze in cold weather and cause brake failure.
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There might not be enough antifreeze in the system.
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Your transmission fluid may drain out.
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22.
Which of the following is NOT a reason for hydraulic brake failure?
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Brake fade on long hills
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Stab braking
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Loss of hydraulic pressure
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All of the above.
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23.
An alcohol evaporator is important during:
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cold weather.
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windy weather.
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dry weather.
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hot weather.
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24.
A low air pressure warning signal is required on:
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all vehicles with air brakes.
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Warning signals are optional.
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all vehicles with air brakes built after 2009.
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all vehicles with air brakes built after 2005.
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25.
Spring brakes are usually held back by:
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the brake pedal.
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the antilock braking system.
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modulating control valves.
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air pressure.
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