[Bluepen]

I'm starting to work on the brakes for my '46 Chevy Panel. The question I have is about residual valves. Now I have a disc/drum brake set up and the diagrams I'm looking at from ECI show the master cylinder below the the top of the calipers so residual valves are needed. Well my master cylinder is up on the firewall well above the calipers and I have a proportioning valve from a 80's 1/2 ton Chevy pick-up that I'm going to use. So the question I have is do I still need the residual valves?? Also I was told that the proportioning valve I have may be a combination proportion/residual valve, how can I tell the difference??

Thanks
David

[BOBCRMAN@aol.com]

With the master on the fire wall you don't need the residual valves, There is one already in the master for the rear brakes. The disc brakes only need it if the master is lower than the wheel cylinders.. The prop. valve you have, if it is a stock one, is a "multi-function valve". It functions as a proportioning valve, turns on the "idiot" light if the system has a problem, and times the front to rear application of pressure.

It will have a stud sticking out that a wire goes to. Usually mid unit.