Proportioning valve question

[CityHick]

Here's a question for anybody familiar with the proportioning valve sold by WH...

I recently developed a brake fluid leak. In the process I lost some POR-15 off the frame, but that's an easy fix. Please take a look at the attached picture and tell me what the purpose of the circled fitting is. That rubber "cap" snaps on and off and below it is a hex fitting. Mine was loose and it appears to be what was leaking. It was actually only finger tight! I have since tightened it up and I *think* the problem is solved - but this is a slow leak that usually takes a couple days to form a puddle on the ground below the Bronco. The rest of the fittings on the prop valve are tight and dry.

I looked at the document that came with it and the .pdf on WH's site, and neither shows what that fitting actually is. I suspect it is part of the internal valving, but it is my understanding that this is not an adjustable valve, so why would this thing be loose???

TIA
-Tony

[blwngsket]

Re: Proportioning valve question

Don't know bud, but I think I'm gonna check mine. Thanks
T

[crawlin68]

Re: Proportioning valve question

I'm not using that piece, so I can't much help on this. But have you called WH to inquire with them? Give Mark a call or he may even chime here.

[904Bronco]

Re: Proportioning valve question

My guess is that it is a service port to gain access to the internal parts...

I am thinking that for whatever reason you got the one built on Friday that was not tight from the factory.

As long as it does not leak and there has been no change in braking, you should be good-to-go.

Doug

[CityHick]

Re: Proportioning valve question

After a few evenings of scratching my head trying to locate the leak I finally popped that rubber cap off and found it was wet inside. That is when I noticed that fitting being loose.

Doug you are probably right on all counts - built on a friday, and a service port to access the internal components. The only reason I haven't called WH is because I literally discovered this problem about an hour ago and they're closed... I will probably call them tomorrow unless Mark chimes in here.

Strangely it hadn't been leaking (or at least not leaking much) until a couple of weeks ago. I first noticed it after taking my dad for a spin, at speeds up to 70mph! I'm glad to have found the problem, and even more glad it didn't totally fail on me especially during one of my high speed passes behind Fordcore's shop at the Livermore Airport!

Definitely worth checking for anybody who has this piece installed!
-Tony

[fordnut77]

Re: Proportioning valve question

I got one, I'll have to check it!

[seahawkfan]

Re: Proportioning valve question

Don't know bud, but I think I'm gonna check mine. Thanks
T

Yeah, me too.

[Spaceburger]

Re: Proportioning valve question

..I am thinking that for whatever reason you got the one built on Friday ... Doug

Personally I think it was probably built Monday Morning! I have one better check too. DAMN.

[CityHick]

Re: Proportioning valve question

Well shit. I went out with some friends this evening, came home and I figured I'd do a puddle check. Sure enough there's a freaking brake fluid puddle under my Bronco again. A much smaller one though... There must be another fitting to tighten somewhere.

[desertoasis2b]

Re: Proportioning valve question

my first one started leaking at about 3k miles from the same place, so I bought another one and now it started leaking yesterday at about 1k miles
except its leaking from the other end where the brake line comes out, I tightened it up and so far so good.