HAWAII CDL AIR BRAKES PRACTICE TEST
21.
Why must air tanks be drained?
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To keep from fouling the air compressor oil.
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Water and
oil reduce the air pressure.
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Water can freeze in cold weather and cause brake failure.
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22.
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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left and right.
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normal and slippery.
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23.
If the ABS is not working:
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the vehicle will have no brakes.
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the vehicle will have weak brakes.
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you still have normal brake functions.
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24.
Dual tires:
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should not come in contact with each other.
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should always come in contact with each other.
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should come in contact with each other whenever possible.
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25.
In some vehicles a modulating control valve may be used to:
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apply the front brakes.
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apply the spring brakes gradually.
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decrease the pressure in the brake system.
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