CDL Air Brakes 71 Questions And Answers
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Terms in this set
71
The application pressure gauge shows how much air pressure you:
Are applying to the brakes
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below _ psi.
20 psi
Your truck has a dual air system, and one of the systems loses its pressure. What will happen?
Either the front or back brake will not be fully operational.
Parking or emergency brakes of trucks and buses can be legally held on by -
_ pressure.
_ pressure.
Spring pressure
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
Release the spring emergency/parking brakes to move a short distance.
If your truck has a properly functioning dual air brake system and minimum-size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
45 seconds
How should you check that your service brakes are working properly?
Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. Then apply the brakes firmly.
A straight truck or bus air brake system should not leak at the rate of more than _
_ psi per minute
with the engine off and the brakes released.
_ psi per minute
with the engine off and the brakes released.
2 psi per minute
During normal driving, spring brakes are usually held back by:
air pressure
The air compressor stops pumping air at what psi?
125 psi