What is the function of the air brake governor?

What is the function of the air brake governor?

• A. It maintains the brake system pressure within a specified range by starting and stopping the compressor.
• B. It filters the air entering the cabin.
• C. It manages the vehicle's steering angle.
• D. It controls the engine idle speed.

Answer: (A)

The air brake governor keeps the brake system’s air pressure within a safe operating range by controlling the compressor. When the system pressure falls to the lower limit, the governor signals the compressor to start pumping air. When it rises to the upper limit, it stops the compressor to prevent over-pressurization. This on-off cycling maintains a ready supply of compressed air for braking and for other air-powered components, ensuring brakes work reliably even during heavy use or long descents. It isn’t involved in cabin air filtration, steering, or engine idle control, which are separate systems.

The air brake governor keeps the brake system’s air pressure within a safe operating range by controlling the compressor. When the system pressure falls to the lower limit, the governor signals the compressor to start pumping air. When it rises to the upper limit, it stops the compressor to prevent over-pressurization. This on-off cycling maintains a ready supply of compressed air for braking and for other air-powered components, ensuring brakes work reliably even during heavy use or long descents. It isn’t involved in cabin air filtration, steering, or engine idle control, which are separate systems.