CDL AIR BRAKES PRACTICE TEST - COLORADO
16.
Air tank drains:
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are used to remove water and oil from the air tanks.
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protect the tanks and the rest of the system from too much pressure.
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are used to move air to the brakes.
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should not be used in wet weather.
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17.
If you are feeling sleepy, you should:
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drive faster.
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get some coffee.
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slow down.
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pull off the road and rest.
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18.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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45
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20
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12
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60
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19.
The emergency brake system:
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uses the service brake to stop the vehicle in the event of a parking brake system failure.
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uses parts of the service and parking brake systems to stop the vehicle in the event of a brake system failure.
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uses the parking brake to stop the vehicle in the event of a brake system failure.
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None of the above.
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20.
If air pressure does not build up fast enough:
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you should put the parking brake on and gently pull against it in a low gear.
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you should turn the electrical power on and step on and off the brake pedal.
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the pressure may drop too low during driving.
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you may be forced to turn off the engine and release the parking brake.
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