AIR BRAKES CDL PRACTICE TEST - WASHINGTON
16.
To perform an applied leakage test, the vehicle’s air pressure should be built up to maximum pressure. Check the air gauge to see that the air pressure should drop no more than:
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1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
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17.
To prevent drowsiness you should:
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never drive with a passenger.
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get adequate sleep before a trip.
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schedule trips for the middle of the night.
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18.
It may not be safe to operate at legal maximum weights:
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in hot weather.
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during bad weather or in mountains.
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on two-way streets.
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19.
Oil and water usually collect in the bottom of the air tank. If you do not have an automatic drain valve, you should drain the air tanks:
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after every six hours of service.
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at the end of each day of driving.
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once a week.
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20.
Excessive use of the service brakes results in overheating. Too much heat can:
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cause the brakes to grab.
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cause the brakes apply unevenly.
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make the brakes stop working.
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