Final answer:
The governor in an air compressor system typically stops pumping air at a cut-out level of around 125 psi to prevent over-pressurization.
Step-by-step explanation:
The governor on an air compressor system stops pumping air when it reaches the "cut-out" level, which is typically around 125 psi (pounds per square inch). This pressure setting is designed to maintain a safe and functional air system, preventing over-pressurization and potential damage to the compressor or related equipment. The cut-out level is a critical component in the operation of pneumatic systems, such as those found in heavy machinery, automotive systems, and various industrial applications.