GEORGIA CDL AIR BRAKES PRACTICE TEST
11.
Spring brakes:
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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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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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All of the above.
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12.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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every 15 minutes.
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if there is too much pressure.
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if there is too little pressure.
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at 30 psi.
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13.
The spring brakes come on:
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when you bring the vehicle to a complete stop right away.
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when main air pressure is lost.
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when you lose ABS control.
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14.
The safety relief valve is located:
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in the first tank the air compressor pumps air to.
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in the front brake.
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on the dashboard.
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on each end of the vehicle's axles.
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15.
When coupling, you should:
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be aware that wrong coupling and uncoupling can be very dangerous.
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make sure the trailer wheels are not chocked.
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make sure the sliding fifth-wheel is locked.
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make sure the trailer kingpin is bent.
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