CDL Air Brakes Practice Test Results

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