AL CDL AIR BRAKES PRACTICE TEST
21.
If air doesn't flow all the way to the back:
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your brakes will not work properly.
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a rollover is more likely.
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the trailer will tend to swing around.
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your lower fifth wheel may fall off.
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22.
Overloading a vehicle with cargo can have negative effects on all of the following except:
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Steering
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Weight limits
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Speed control
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Braking
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23.
Air brakes:
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should be used only when driving on wet roads.
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are prohibited on larger vehicles.
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can improve fuel efficiency.
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are an effective way to stop large and heavy vehicles.
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24.
What is the best way to test the low air pressure warning signal?
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Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
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pump the brakes until the air pressure drops below 45 psi.
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step on and off the brake pedal while the engine is running.
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All of the above.
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25.
To control your speed on a downgrade, you should:
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use controlled braking.
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use engine braking.
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coast in neutral.
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fully apply the brakes.
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