Air Brake Safety Valve Deploys. GMC Truck GMC C-Series Medium Duty Truck B7 1998

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Air Brakes 🢒 Air Brake Safety Valve Deploys

Checks	Action
Check if the governor cut-out adjustment is too high	Refer to Air Compressor Governor Valve Diagnosis .