AIR BRAKES CDL PRACTICE TEST - MINNESOTA
21.
When going down a steep downgrade, you should:
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use escape ramps whenever possible.
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use a low gear, and a proper braking technique.
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use the parking brake.
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avoid braking and rely on engine braking.
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22.
To check that spring brakes come on automatically, the first thing to do is to:
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continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
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turn off the engine, release the parking brake and time the air pressure drop.
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All of the above.
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23.
Brake drums or discs must not have cracks longer than ____ the width of the friction area.
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1/4
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1/2
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1/3
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1/5
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24.
Some vehicles have a separate air tank which can be used to:
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release the spring brakes.
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unload cargo or passengers.
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turn on the 4-way emergency flashers.
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hold the vehicle or combination of vehicles stationary.
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25.
It may not be safe to operate at legal maximum weights:
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on two-way streets.
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on highways.
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during bad weather or in mountains.
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in hot weather.
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