AIR BRAKES CDL PRACTICE TEST - MAINE
21.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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high and low.
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normal and slippery.
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left and right.
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22.
Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
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for one day
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several times
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for one stop
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23.
When the low air pressure warning light and buzzer first come on, you should:
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bring the vehicle to a safe stop right away.
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downshift and slow down.
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speed up to restore pressure.
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24.
When you use your mirrors while driving on the road, you should:
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only use the driver's side mirror.
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check them quickly.
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avoid checking them regularly.
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25.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute after the initial pressure drop are:
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1 psi for single vehicles and 2 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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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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