CDL Air Brakes Practice Test Results

Question 1
50% answer correctly
Modulating control valves are used to:
Apply the spring and air brakes together
Apply the spring brakes gradually
Apply the air brakes gradually
Switch between spring and air brakes
Question 2
43% answer correctly
For vehicles that use air brakes, emergency and parking brakes:
Are not required
Can only be air brakes
Must be mechanical brakes
Must be a combination of mechanical and air brakes
Question 3
59% answer correctly
Maximum leakage rates are more than __________ psi in __________ minutearray(s).
3, 1
2, 1
2, 2
3, 2