Air Pressure Excessively Low or High. GMC Truck TopKick C-Series Commercial (Cutaway) C4/C5 2005

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2005 🢒 TopKick C-Series Commercial (Cutaway) C4/C5 🢒 Brakes 🢒 Air Compressor 🢒 Air Pressure Excessively Low or High

Problem	Action
The governor is leaking.	Overhaul or replace the governor.
The air compressor is leaking.	Check the fittings, the bolts, and the mating surfaces. Tighten or repair as needed.
The unloader is not functioning.	Overhaul the cylinder head assembly.
The governor is faulty.	Overhaul or replace the governor.