I believe the original master cylinders use an internal 10 lb residual valve. I put a proportioning in the rear circuit of my 1 ton because the brakes were too powerful since I don’t carry loads. On slippery surfaces they tended to lock up.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!