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Unread 10-11-2006   #1 (permalink)
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Exclamation Need help! Proportioning Valve leaking!

I got a 1989 LX Stang and the proportioning valve just recently started leaking. It is leaking at the front plug. I am trying to find an original, non-adjustable valve, or just the replacement plug for the original valve. If anyone has any ideas please let me know b/c I am going crazy trying to find one. Thanks in advance.
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Unread 10-11-2006   #2 (permalink)
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Pull the leaky plug. Wrap the thread in thread tape real good. And tighten the
Sh@t out of it. If that doesn't work go to a scrap yard and get a new valve.
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Unread 10-31-2006   #3 (permalink)
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I tried removing the front plug, but it seems really stuck in there, I am still trying to get the factory original, does anyone know if other year mustang proportioning valves would work b/c I can't track down the original, or can anyone tell me about the adjustable proportioning valves? I have heard that they are hard to adjust to just a normal factory like break settings. Thanks in advance.
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Unread 11-01-2006   #4 (permalink)
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Just snag one from a junk yard.
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Unread 11-01-2006   #5 (permalink)
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When I bought my car I had No rear brakes. Found out it was the proportioning valve.
looked around at scrapyards. Found one for $10. '79-'93 are all basically
the same. Just make sure all the flare nuts are the same size. That
cost me an extra trip out to the scrapyard. The flare nuts on my car and original
valve were all the same size, and the scrapyard valve had larger holes only in
the top, for larger flare nuts. I got the right valve, and my brakes have been mint
since. As far as getting them loose, use lots of penetrating fluid. And if they are stripped
a good pair of little vise-grips may be the only option. Be gentle and you'll be able to re-use
them. Put some anti-seize on the threads if you do.
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Unread 11-01-2006   #6 (permalink)
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check PPI, im pretty sure they have them (in the suspension/chassis section i believe)

http://performancepartsinc.com/
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Unread 12-02-2006   #7 (permalink)
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Okay, I am having the same problem with my gf's 93 LX 2.3. It is leaking out of the hole in the front pulg. I got one from salvage yard... same thing. Could it be possible that TWO could be bad, or is there something else that is causing the leak? This is a dealer only item too and it is discontinued. I have to wait until Monday to get a replacement from the yard. Oh yeah, the dude at the yard said I should be safe with any 87-93 2.3 p-valve, the replacement was from a 88 vert and everything was idential.
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Unread 12-03-2006   #8 (permalink)
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It is probably the O Ring that is going bad on the Front Plug which would end up causing the leaks.
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Unread 12-10-2006   #9 (permalink)
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Well I got another from the salvage yard and it looked in much better shape this time. I put it all back together and I ended up cross-threading one of the fittings. The part was jacked. I pulled out the guts and put them in the first one from the junk yard in hopes that would fix the problem. It's been a week and no leaks.
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Unread 03-28-2011   #10 (permalink)
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Default Proportioning valve leak

I've got the same problem on a 1987 Ford. Leak is in the front plug of the proportioning valve.

Tried several sites and brick stores, along with Ford, and have not been able to source the part.

So the front plug has a manufactured hole in it, and I can see the rubber gasket (seal?) in the middle of the plug that is swollen and leaking.

I do not believe an O-Ring is going to work, because somehow I need to seal the hole in the middle of the plug.

I'm actually considering pulling the plug and filling it will RTV, maybe put an O-Ring on the side if it looks like the application will work. The problem is that the internal plunger gasket is likely also deteriorated.

Replacing the plug with a solid plug doesn't work, because I don't want to bypass the proportioning valve (for example, Mustang Brake Proportioning Valve Plug, M-2450-A by Ford Racing at LRS - Same Day Shipping!)

Oh, and since this thread started in 2006, "Cash for Clunkers" apparently took most of the 87-93 vehicles out of the junk yards. So... that option, at least in South Florida, doesn't look to be available.

Has anyone rebuilt the proportioning valve with RTV? Or been able to find a rebuild kit?

--Mark

Mark Satterfield - Florida, Miami, Clearwater, Tampa, Melbourne, Orlando - Computers, Engineering
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