CDL Air Brakes Practice Test - Maine
21.
What is the best way to test the low air pressure warning signal?
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step on and off the brake pedal while the engine is running.
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pump the brakes until the air pressure drops below 45 psi.
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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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22.
When the spring brakes are on, you should never:
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push the brake pedal down.
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upshift.
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change lanes.
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23.
Typically an air system is fully-charged at:
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75 psi
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25 psi
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125 psi
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24.
An anti-lock braking system (ABS):
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helps you avoid skids caused by over braking.
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helps you avoid wheel lock up.
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All of the above.
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25.
If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
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3 seconds
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2 seconds
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4 seconds
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