At what PSI does the air compressor governor cut out?

The air compressor governor in commercial vehicles is designed to control the air pressure in the system, ensuring it remains within optimal operating ranges. The cut-out pressure is a specific threshold where the governor stops the compressor from pumping air into the system to prevent over-pressurization.

When it reaches the cut-out pressure of 125 PSI, the governor signals the compressor to stop building pressure. This is a crucial feature for maintaining the efficiency of the air brake system and overall vehicle safety. Operating within this defined range helps prevent damage to components and ensures that the brakes function effectively when engaged. Understanding this aspect is important for drivers, as it directly relates to the safe operation of vehicles equipped with air brakes.