CDL Air Brakes Practice Test Results

Question 1
76% answer correctly
An air tank safety valve is typically set at how many psi?
200
125
150
100
Question 2
35% answer correctly
Automatic air tank drains should be emptied how often?
Weekly
Daily
Never
Monthly
Question 3
43% answer correctly
For vehicles that use air brakes, emergency and parking brakes:
Can only be air brakes
Must be mechanical brakes
Are not required
Must be a combination of mechanical and air brakes