Arizona Air Brakes CDL Practice Test

The air compressor directly communicates with the air compressor governor because the governor's primary role is to control the compressor's operation based on the air pressure levels in the system. When the pressure drops to a certain level, the governor signals the air compressor to start building pressure again. Conversely, when the air tanks reach the desired pressure, the governor tells the compressor to stop. This regulation is crucial for maintaining the proper air pressure needed for the braking system's functionality. In this system, while the air tanks store compressed air and the brake pedal activates the braking process, they do not have the same direct communication role with the governor. The brake lines carry the air pressure from the tanks to the brakes but also do not interact with the governor directly. The air compressor is the component that generates the pressure, so its connection with the governor is essential for the overall operation of the air brake system.