CDL Air Brakes Practice Test Results

Question 1
55% answer correctly
Dual parking control valves are used in which of the following circumstances?
When air pressure is at its maximum
During routine operation
While parked
During emergencies
Question 2
59% answer correctly
Maximum leakage rates are more than __________ psi in __________ minutearray(s).
2, 1
2, 2
3, 2
3, 1
Question 3
69% answer correctly
If the air compressor stops working, air brakes:
Can be used indefinitely
Immediately fail
Cannot be used
Can still be used several times