What is the primary function of the governor in an air brake system?

The primary function of the governor in an air brake system is to maintain proper air pressure. The governor is a crucial component that monitors the air pressure within the brake system. When the air pressure drops below a predetermined level, the governor activates the compressor to increase the pressure back to the appropriate level. This ensures that there is sufficient air pressure available for effective braking, as the entire air brake system relies on the correct levels of compressed air to function properly.

By maintaining the proper air pressure, the governor ensures that the brakes can be applied reliably when needed and helps prevent brake failure due to inadequate pressure. This is vital for the safety of the vehicle and its occupants. The governor also plays a role in preventing the pressure from exceeding safe limits, which can help avoid damage to the brake system components. Thus, its primary role is fundamentally tied to ensuring the air brake system operates efficiently and safely by regulating air pressure effectively.