CDL AIR BRAKES PRACTICE TEST - WISCONSIN
16.
When the low air pressure warning light and buzzer first come on, you should:
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immediately put alcohol into the air system.
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bring the vehicle to a safe stop right away.
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speed up to restore pressure.
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downshift and slow down.
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17.
By pushing the trailer air supply control knob in, you:
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shut the air off and put on the trailer emergency brakes.
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supply the tires with air.
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supply the trailer with air.
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keeps air in the tractor or truck brake system.
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18.
Air tanks must be drained completely to:
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remove all moisture and oil.
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put alcohol into the air system.
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pump water and compressor oil into the tanks.
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remove all the air.
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19.
To check slack adjusters on S-cam brakes, you should:
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press the brake pedal and listen for any strange noises.
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check that the spring brakes come on automatically.
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use gloves and pull hard on each slack adjuster you can reach.
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All of the above.
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20.
When you push the brake pedal down, air brakes work:
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only when ABS is working.
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after about 15 seconds.
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after a short delay.
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immediately.
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