At what pressure does the governor place the compressor into the "loading" stage?

The governor places the compressor into the "loading" stage at a pressure of 80 psi because this is the designated threshold at which the air brake system requires additional air pressure to ensure optimal operation. When the air pressure in the system falls below this level, the governor engages the compressor, allowing it to pump air into the system. This mechanism ensures that there is sufficient air pressure available to operate the brakes effectively.

Understanding this pressure point is crucial for maintaining the performance and safety of air brake systems, as it directly impacts the ability of the system to generate and maintain the necessary pressure for braking. This knowledge helps in diagnosing potential issues within the brake system and ensuring compliance with safety standards.