Hi all, looking for part numbers, or specs on the combination/proportion valve for a 1985 GMC 1/2 ton truck. I am/will be using a 1 ton Hydro-Boost and master, stock brakes all around(rear 11 3/4 inch drums)
I remember reading that 34-4054 is the part number for the valve, but nothing has come up with my search, and most other valves appear to be for 1977 and down.
I was going to reuse my valve, but it looks like it went bad from sitting-or it was bad, fluid looked terrible when I drained it in the fall.
thanks