CDL Air Brakes Practice Test Results

Question 1
72% answer correctly
Spring brakes and air brakes should __________ be used together.
Frequently
Always
Never
Sparingly
Question 2
76% answer correctly
An air tank safety valve is typically set at how many psi?
200
150
100
125
Question 3
55% answer correctly
Dual parking control valves are used in which of the following circumstances?
When air pressure is at its maximum
While parked
During routine operation
During emergencies