Arizona Air Brakes CDL Practice Test

During vehicle operation, why is the function of the air compressor critical?

1. It regulates brake fluid pressure.

2. It prevents overheating of the vehicle.

3. It supplies air for braking.

4. It controls traction of the tires.

The correct answer is: It supplies air for braking.

The function of the air compressor is critical because it supplies air for braking. In air brake systems, the compressor generates compressed air that is stored in air tanks and used to activate the brakes. When the driver applies the brake, the compressed air is released from these tanks and flows into the brake chambers, which then push the brake shoes against the drums or discs, causing the vehicle to stop. The importance of this function cannot be overstated, as without a properly functioning air compressor, the air brake system would fail to operate effectively, compromising the vehicle's ability to stop safely. Proper maintenance and monitoring of the air compressor are essential for ensuring reliable braking performance, thus highlighting its critical role in the overall braking system.