Cat420
Senior Member
I need some help with the brakes on our truck. It's a 77 GMC 6500 with hydraulic brakes and hydro-boost. Both the master cylinder and booster are shot, but I'm having trouble finding parts. Apparently the hydro-boost stuff wasn't a common option and it looks like the master cylinder is unique to this system.
Does anyone know a source for the hydro-boost parts or have information like part numbers for converting it to vacuum assist brakes if I can't find parts?
Does anyone know a source for the hydro-boost parts or have information like part numbers for converting it to vacuum assist brakes if I can't find parts?