CDL Air Brakes Practice Test Results

Question 1
51% answer correctly
When is comes to stopping power, front wheel brakes __________ conditions.
Vary with
Show greater stopping power when lightly loaded
Operate poorly when under load
Show greater stopping power in bad weather
Question 2
55% answer correctly
Dual parking control valves are used in which of the following circumstances?
During emergencies
When air pressure is at its maximum
While parked
During routine operation
Question 3
50% answer correctly
Modulating control valves are used to:
Switch between spring and air brakes
Apply the air brakes gradually
Apply the spring brakes gradually
Apply the spring and air brakes together