Practice question

What is the purpose of the air dryer in the brake system?

To cool the air before storage
To remove moisture and oil before air reaches the tanks
To increase compressed air pressure
To warn the driver of low pressure

Answer: B — To remove moisture and oil before air reaches the tanks

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Texas CDL Air Brakes Practice Questions - Texas CDL Air Brakes Knowledge Test Exam →