CDL AIR BRAKES PRACTICE TEST - NEBRASKA
16.
If the safety relief valve in the air brake system releases air:
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something is wrong.
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this will supply more power to the drive wheels.
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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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17.
The safety valve is usually set to open at:
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75 psi.
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150 psi.
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100 psi.
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200 psi.
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18.
When you apply the brakes, the brake shoes and linings are pushed against:
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the supply pressure gauge.
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the safety relief valve.
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the S-cam.
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None of the above.
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19.
Which of the following is NOT a reason for hydraulic brake failure?
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Loss of hydraulic pressure
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Brake fade on long hills
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Stab braking
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All of the above.
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20.
Air storage tanks:
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are installed in the first tank the air compressor pumps air to.
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pump air into the air storage tanks.
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use parts of the service brake systems to stop the vehicle in a brake system failure.
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hold compressed air for the brakes.
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