IN CDL Air Brakes Practice Test
21.
Air brakes use ________ to make the brakes work.
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compressed air
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compressed gases
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compressed oil
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compressed gas cylinders
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22.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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Only while you are taking a rest break.
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When you are conducting your pre-trip inspection.
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Never.
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When the tank pressure falls to the "cut-in" pressure.
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23.
Your mirrors should be adjusted so that:
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the rear of the vehicle is visible in the mirror.
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a part of the vehicle is visible in the mirror.
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no part of the vehicle is visible in the mirror.
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more than half of the mirror shows the vehicle.
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24.
How do you test hydraulic brakes for leaks?
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Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.
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Pump the brake pedal ten times and see if it holds.
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Pull forward against parking brake to make sure the hydraulic brakes holds.
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None of the above.
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25.
If the ABS is not working:
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you still have normal brake functions.
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the vehicle will have no brakes.
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the vehicle will have weak brakes.
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None of the above.
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