At what psi does the governor cutout occur?

Answer: C — 120-140 psi

The governor cutout for a vehicle's air brake system occurs in the range of 120 to 140 psi. This is an important function that helps to maintain safe and effective braking performance in a vehicle equipped with air brakes. When the air pressure in the system exceeds the governor cutout level, the governor will stop the compressor from pumping additional air, preventing over-pressurization of the system. The governor cutout is crucial because it helps ensure that the vehicle has a sufficient supply of air pressure available for operating the braking system while also preventing damage to the system from excessive pressure levels. Maintaining air pressure within these parameters enhances the reliability and safety of the braking system, ensuring that the vehicle can stop effectively when needed. Understanding these specifications is essential for drivers to ensure their vehicle operates safely and complies with regulatory standards regarding air brake systems.