NEW JERSEY CDL AIR BRAKES PRACTICE TEST
11.
The s-cam:
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pulls the brake shoes away from the drum.
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helps ensure that air flows to all trailers.
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forces the brake shoes away from one another and presses them against the inside of the brake drum.
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All of the above.
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12.
In newer vehicles with air brakes, you put on the parking brake:
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using a diamond-shaped, yellow, push-pull control knob.
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moving the orange push-pull lever to the right.
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using a P-shaped, yellow control knob.
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placing the transmission in Park.
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13.
If your brakes fail while you are driving on a downgrade, you should:
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use an escape ramp if it's available.
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immediately start looking outside your vehicle for something to stop it.
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take the least hazardous escape route you can.
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All of the above.
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14.
Emergency brakes are:
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not required on doubles.
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not required on buses.
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required on all vehicles.
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not required on commercial vehicles with air brakes.
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15.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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Never.
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When you are conducting your pre-trip inspection.
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When the tank pressure falls to the "cut-in" pressure.
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Only while you are taking a rest break.
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