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

Answer: B — To maintain the correct air pressure in the system

The governor in an air brake system plays a critical role in maintaining the correct air pressure within the system. It is responsible for monitoring the air pressure and ensuring that it remains within designated limits, which is essential for the effective functioning of the brakes. When the air pressure falls below a certain threshold, the governor activates the compressor to refill the air tanks to maintain adequate pressure. Conversely, if the pressure exceeds the upper limit, the governor can divert excess air, helping prevent over-pressurization that could damage the system or impair braking performance. Maintaining proper air pressure is crucial for both safety and functionality. If the air pressure is insufficient, the brakes may not engage properly, leading to potential hazards while driving. Hence, the governor serves as an important regulator, ensuring that the braking system operates smoothly and reliably throughout its use.