Help, I need a 71&up brake proportioning valve

[njsteve]

Anyone have the cast iron disc brake proportioning/combination valve for a 71 and up Camaro/Firebird with disc/drum? I believe the other GM models of the same era use this same valve. The current replacement seems to be a brass valve that looks nothing like the original.

I just noticed that mine is seeping fluid from the red arrow location. Luckily I use silicone brake fluid so no paint is damaged, but it is pissing me off, as well as being a major safety issue.

I dont see anyone selling these anywhere. You can find them for the Ist Gen F-bodies but not the 2nd gens.

[fro71]

inline tube has them http://www.inlinetube.com/ was just looking at them the other nigh.



chris

[njsteve]

They don't sell the original cast iron valve, just a brass replacement that looks nothing like the original part.

[Keith Tedford]

I was talking to John Stuart Power Brakes in Stoney Creek, Ontario and they said that they can rebuild these 1-905-662-7274. I'll be sending them one of these cast iron units that I took off of our '72 Lemans Sport along with a load of other stuff. I replaced it with the brass one that GM was selling at the time. You might want to check with them to be sure.

[L78steve]

If you still need one I have one from a 74 Z/28 and my have one from a 71 Nova.

[njsteve]

Thanks for the offer, but I got an extra on its way and also sent mine out to be rebuilt. [img]<<GRAEMLIN_URL>>/beers.gif[/img]

[njsteve]

Got the proportioning/combination valve back from a Performance Years website member, 70RAIII (Bill Oxley) who did a really nice job rebuilding it. He indicated that it was all stuck inside, so it wasn't really functioning as anything other than a T-fitting between the front and back fluid routes. Now it's actually working as designed, which is a good thing since if I recall correctly, one of the critical roles of this valve is to internally shift and block the internal passages if one circuit springs a leak and loses fluid. That way you still have braking power for the remaining circuit.

Another thing I noticed is that the purple DOT 5 silicone brake fluid turns yellow after a few years. I'd imagine that means it's time to replace it all, which I did. I flushed the entire system and replaced it with new DOT 5 silicone brake fluid, about four bottles worth, to get all the old stuff out and completely flush the system of the four year old fluid.

The newly refurbished proportioning/combination valve, just back from Bill Oxley:



And after the installation and the brake bleed-a-thon:

[SuperNovaSS]

Steve,

Out of curiousity, is there a reason you did not try to tackle the rebuild yourself?

Jason

[njsteve]

Access to the correct seals/o-rings mainly. No one really sells them anywhere. Not just your everyday standard rubber pieces. Plus, the guy that did my valve does a lot of these contraptions and had the extra parts needed in case something broke, or was too pitted or rusty, which is a rather common discovery when taking them apart.

[SuperNovaSS]

Gotcha, I thought that may be the case.


Jason