AIR BRAKES PRACTICE TEST - NEBRASKA
11.
What should you do to test your vehicle's low air pressure warning signal?
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Pump the brakes until the air pressure drops below 80 psi.
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Release the parking brake valve and the tractor protection valve and reduce the air pressure by stepping on and off the brake pedal.
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With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
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With the engine running, put the vehicle in a forward gear and attempt to drive forward.
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12.
To check that spring brakes come on automatically, the first thing to do is to:
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release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
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turn off the engine, release the parking brake and time the air pressure drop.
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continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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All of the above.
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13.
Which of the following is NOT correct? An ABS system:
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helps you avoid wheel lock up.
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reduces the braking pressure to a safe level.
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helps you stop faster.
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is a safety anti-skid braking system.
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14.
To make the brakes work, air brakes use:
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hydraulic air.
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nitrogen.
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compressed air.
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carbon monoxide.
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15.
To check the slack adjusters:
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check the air hoses connected to the brake chambers to make sure they aren't cut or worn.
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Park on level ground and chock the wheels, release the parking brakes and pull hard on each slack adjuster. The slack adjuster shouldn't move more than one inch.
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park downhill and see if the vehicle rolls.
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None of the above.
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