PROPORTIONING VALVE LEAK

[CFD244]

Hi Folks

Just the facts mam.......1971 demon with power Kelsey Hayes disc brakes and a Weatherhead proportioning valve.

I rebuilt the valve using the Muscle Car research LLC kit. With the engine out, I have been struggling with the sealing ring on the top fitting. I have tried several washers, tried annealing it, tried various torquing.......I thought it was solved on my last go around, so I installed the engine, and front suspension and now the F'n thing is still leaking. All of the flared fittings are dry as a bone. I really don't relish removing all of the freshly bent lines and swapping out the complete valve with the limited work space now.........Any suggestions?

 

[Heywodja]

Doctor Diff sells new ones


Mopar 1 Piece Proportioning Valve

 

[CFD244]

Doctor Diff sells new ones


Mopar 1 Piece Proportioning Valve

Thanks

I have one of those as well, but I read some bad press on them due to leaks as well......LOL, the reason I rebuilt the old one instead of using it

 

[Heywodja]

I may have one I took off my car disc front rear drum power assisted

 

[1WildRT]

If it's just the sealing washer I would swap in one of these....

McMaster-Carr

Or....

McMaster-Carr

 

[davescuda]

I had the same issue. My friend took a hair of the top. The rough casting was just enough to course it not to seal.

The aftermarket one are not good either. They are leakers also.

 

[CFD244]

I had the same issue. My friend took a hair of the top. The rough casting was just enough to course it not to seal.

The aftermarket one are not good either. They are leakers also.

View attachment 1716343372

Hey Dave....Did you manually dress it, or a light pass on a mill?

 

[davescuda]

My friend is a tool, and die guy. Milled just hair off it.

 

[4mulas]

Doctor Diff sells new ones


Mopar 1 Piece Proportioning Valve

I had one his leak there too. When I spoke to him he said to just throw a wrench on it and tighten more than you think is necessary until it kind a chirps (ie is very tight) and it should stop. It did.

On another note though I found that there isn’t much proportioning on it. The rears in that car will lock up before the front. In fact I can’t get the front to lock up at all.
Its his 2 post master 15/16 bore, his 73 and up A body one piece pro valve, new Kelsey 4 piston brakes, and oem 2"w x10" rear drums. Not that happy. Going to change out to oem pro valve and oem big bolt pattern stuff soon on that car…