CDL Practice Tests
CDL Home Page
CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
Contact
Privacy Policy
Take a Practice Test
CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Air Brakes Practice Test
Question 1 of 3
What causes air brakes to fade?
A
Out of adjustment brakes
B
Low air tank pressure
C
Air leaks
D
All of these are correct
Next