AIR BRAKES CDL PRACTICE TEST - LOUISIANA
6.
The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
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it is a safe-driving brake.
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"S" stands for "Shoes".
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it applies a "Shock" to the brakes.
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it is shaped like the letter "S".
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7.
You should drain the air tanks completely. If water and oil collect in the air tanks:
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your brakes could become hard to press.
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your brakes could heat up.
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your brakes could fail.
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None of the above.
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8.
The Johnson bar is a valve that:
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reduces the braking pressure to a safe level.
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is installed in the first tank the air compressor pumps air to.
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works the trailer brakes.
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keeps air from going out if the air compressor develops a leak.
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9.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute are ___ psi for single vehicles and ___ psi for a combination of 2 vehicles.
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3; 2
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5; 6
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3; 4
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4; 5
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10.
Emergency brakes must be held on by:
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mechanical force.
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air pressure.
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hydraulic pressure.
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dynamic pressure.
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