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The cut-out pressure should be in accordance with the pressure setting of the piece number being used. (Common cut-out pressures are between 105-125 psi.) With the engine still running, make a series of brake applications to reduce the air pressure and observe at what pressure the governor cuts-in the compressor.
Tractor and straight truck spring brakes will come. fully on when air pressure drops to a range of 20 to. 45 psi (typically 20 to 30 psi). Do not wait for the. brakes to come on automatically. When the low air. pressure warning light and buzzer first come on, bring the vehicle to a safe stop right away, while.