First Generation Firebird-L Mailing List ......................................................................... Help! What are the symptoms of a bad combo proportioning valve/brake pressure differential switch? Here's a little background. About two years ago a rear cylinder sprung a leak and I lost the fluid in the rear circuit. I replaced the wheel cylinder and had fits getting it to bleed -- the light simply wouldn't turn off. So, in true American fashion, I unplugged it until I could get back to it. When I returned a few weeks later and plugged it back in, the light stayed off and I merrily drove on (it's my daily driver). Fast forward to a few weeks ago. The master cylinder leaked and rotted out the power booster so I replaced them both. I didn't have any trouble bleeding the system and it has worked fine. Until tonight. I was driving along, and while coming to a stop at an intersection I felt a "pop" sensation in my foot; when I released the pedal the light came on. I about wet my pants but managed to keep going and it seems to drive just fine. But the light stays on. I can't find any apparent leaks. Does this sound like a bad prop valve? By the way -- my 'bird is a mostly-original-ish 3/4 ton long-bed with heavy duty power front disc/rear drum. It's a '71 model -- so it's almost first gen, right? Thanks. Wayne in OKC. ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[email protected]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html>
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