What role does the governor play in an air brake system?

Answer: B — It regulates the air pressure in the system

The governor in an air brake system plays a crucial role in regulating air pressure within the system. It is designed to maintain the appropriate level of air pressure, ensuring that the brakes function effectively and efficiently. This component automatically controls the compressor's operation by regulating when the compressor should supply air to replenish the system when pressure drops below a certain threshold. By doing so, the governor helps to prevent over-pressurization and ensures that there is consistently enough air available for the brake system to perform safely and reliably. Thus, its primary function directly supports the performance and safety of the vehicle's braking system.