AIR BRAKES CDL PRACTICE TEST - MISSOURI
6.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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10 to 20 psi
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100 to 120 psi
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20 to 45 psi
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7.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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50 psi
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150 psi
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8.
When going down a steep downgrade, you should:
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use a low gear, and a proper braking technique.
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avoid braking and rely on engine braking.
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use the parking brake.
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9.
You hear a loud "bang" which sounds like a tire blowout. You should:
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check the tires at the next stop.
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keep driving as normal.
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assume you
have a tire failure.
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10.
When the spring brakes are on, you should:
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press the accelerator.
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not push the brake pedal down.
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pump the brakes.
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