What are the acceptable psi levels for the air governor's cut-in and cut-out pressures?

The acceptable psi levels for the air governor's cut-in and cut-out pressures are typically 85 psi for cut-in and 130 psi for cut-out. Understanding these levels is crucial for ensuring the air brake system in a school bus operates effectively and safely. The cut-in pressure is the point at which the air compressor activates to build pressure in the air storage tanks, while the cut-out pressure is when the compressor stops running because the desired pressure level has been reached.

Maintaining the correct psi levels is vital to ensuring that the braking system functions properly; if the pressures are set too low, the air brakes may not engage effectively, leading to potential safety hazards. Conversely, if the pressures are set too high, it could lead to unnecessary wear on the compressor and the braking system components. This proper range helps to optimize performance and safety in the operation of school buses.