Air compressor governors must cut-out at what maximum psi?

• A. 120 psi
• B. 130 psi
• C. 140 psi
• D. 150 psi

Answer: (B)

The correct maximum psi for air compressor governors to cut-out is 130 psi. This specification is essential for maintaining optimal air pressure in the braking system of the vehicle. When the pressure reaches this cutoff point, the governor triggers the compressor to stop sending air to the system. This helps to prevent over-pressurization, which could damage components or lead to safety issues in the braking system. Keeping the pressure regulated within these parameters is crucial for ensuring that the braking performance remains reliable and effective, especially in heavy vehicles like school buses.

Understanding that the cutoff is set to 130 psi helps drivers and maintenance personnel ensure that the air brake system remains functional without excess pressure build-up, which could lead to complications during operation.