MISSOURI CDL AIR BRAKES PRACTICE TEST
6.
Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:
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drive slower to keep your vehicle in a straight line.
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monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
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brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.
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7.
If the air tanks are not drained:
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your speed must be reduced to 5 MPH below your “safe” speed.
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the air pressure in the tanks is reduced.
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the water can freeze in cold
weather and cause brake failure.
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8.
Some air brake systems have an alcohol evaporator to:
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reduce the stopping power of the vehicle.
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reduce the danger of slipping.
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prevent ice from forming in the brake system.
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9.
Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
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a rear backup camera.
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hydraulic brakes.
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anti-lock brakes.
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10.
Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary
systems should be at least:
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75 psi.
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130 psi.
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100 psi.
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