AIR BRAKES CDL PRACTICE TEST - VERMONT
16.
A low air pressure warning signal:
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is required on all vehicles without air brakes.
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is required on vehicles with air brakes.
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is optional on vehicles with air brakes.
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17.
To test the low pressure warning signal, you should:
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pump the brakes while your vehicle is running.
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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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 until the low air pressure warning signal comes on.
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18.
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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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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19.
If your ABS is not working:
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the drive wheels will begin to spin, and you should take your foot off the accelerator.
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you still have normal brake functions, and should drive and brake as you always have.
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it will slow your truck to a halt and force you to pull over.
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20.
If you must make an emergency stop, you should:
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use the hand brake before the brake pedal.
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brake in a way that will keep your vehicle in a straight line.
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apply the brakes as hard as you can to lock them.
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