CDL General Knowledge TestAir Brakes (if applicable)Easy
Which component of an air brake system is responsible for removing moisture and oil from the compressed air before it enters the air tanks?
- AThe brake chamber.
- BThe foot valve.
- CThe air governor.
- DThe air dryer.
Show answer & explanationAnswer & explanation
Correct answer: D. The air dryer.
The air dryer is specifically designed to remove water vapor and oil contaminants from the compressed air, preventing corrosion and freezing within the air brake system.
Why the other options are wrong
- A. The brake chamber converts air pressure into mechanical force to apply the brakes.
- B. The foot valve (service brake valve) controls the flow of air to the brake chambers.
- C. The air governor controls when the air compressor pumps air into the system.
Air Dryer
A component in the air brake system that removes contaminants like moisture and oil from the compressed air.
- Protects air system components from corrosion and freezing.
- Typically includes a desiccant cartridge.
- Requires regular maintenance (draining or cartridge replacement).
Memory trick: Air System: Compress, Govern, Dry, Store, Brake!