AIR BRAKES CDL PRACTICE TEST - IDAHO
6.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the trailer will stop normally.
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the ABS won't work properly.
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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.
Which of the following is not a way to know when to change gears?
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Check that the pressure gauge shows normal oil pressure
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Use engine speed (rpm)
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Use road speed (mph)
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9.
You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
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activate your hazard lights and drive to the nearest place where you can stop.
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slow down and test your brakes.
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pull off the road and stop immediately.
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10.
The safety relief valve is usually set to open at ____ psi.
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50
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75
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150
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