The air compressor governor controls what aspect of the air brake system?

Answer: B — Pumping of air into the air tanks

The air compressor governor is a key component of the air brake system, responsible for regulating the pumping of air into the air tanks. When the air pressure in the tanks drops to a certain level, the governor activates the air compressor to refill the tanks until they reach the necessary pressure. Once the tanks are adequately filled, the governor will stop the compressor from pumping air, preventing over-pressurization and ensuring that the system operates safely and effectively. This function is crucial because having an adequate supply of compressed air is essential for the proper operation of the air brakes. If the air pressure falls too low, the braking system may not function properly, leading to safety risks while driving. Understanding the role of the air compressor governor helps drivers recognize the importance of maintaining adequate air pressure in their braking systems for safe operation.