CDL Air Brakes Practice Test Results

Question 1
85% answer correctly
You should use the parking brake:
Whenever you`re traveling down a grade
Whenever you`re away from the vehicle
Whenever you`re parked on a grade
When air brake pressure is low
Question 2
50% answer correctly
A safety valve is installed:
On the air compressor
On every air tank connected to the air compressor
On the first air tank connected to the air compressor
On the last air tank connected to the air compressor
Question 3
68% answer correctly
What are spring brakes used for?
Air brakes
Trailer brakes
Emergency and parking brakes
Cab brakes