CDL Air Brakes Practice Test Results

Question 1
51% answer correctly
When is comes to stopping power, front wheel brakes __________ conditions.
Operate poorly when under load
Vary with
Show greater stopping power when lightly loaded
Show greater stopping power in bad weather
Question 2
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
During emergencies
While parked
Question 3
43% answer correctly
For vehicles that use air brakes, emergency and parking brakes:
Must be mechanical brakes
Must be a combination of mechanical and air brakes
Can only be air brakes
Are not required