TEXAS CDL AIR BRAKES PRACTICE TEST
21.
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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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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All of the above.
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22.
If the safety relief valve in the air brake system releases air:
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the valve is fully operational.
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this will supply more power to the brakes.
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something is wrong.
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this will supply more power to the drive wheels.
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23.
You should drain your air tanks:
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every month.
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at the end of each working day.
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at the beginning of each trip.
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at least once a week.
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24.
Spring brakes:
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are usually held back by air pressure.
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will apply the brakes when a leak in the air brake system causes all the air to be lost.
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will come fully on when air pressure drops to a certain range, typically 20 to 30 psi.
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All of the above.
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25.
To test the service brake:
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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gently try to pull forward with the trailer parking brake on, then release the brake.
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push the brake pedal firmly while slowly moving backward.
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push the brake pedal firmly while going about 5 mph.
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