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Username Post: Disk/drum residual pressure valve & pedal pressure issues        (Topic#362012)
RaysnCayne 
Frequent Contributor
Posts: 1061
RaysnCayne
Age: 46
Loc: Richmond, VA
Reg: 07-29-03
08-03-20 01:17 PM - Post#2800218    

Hey all and/or CPP tech,

I recently installed the CPP aluminum "Corvette" MC and basic CPP front disc brake conversion kit on my 68 Biscayne. (Originally manual drums all the way around.) I have two issues, and I wonder if they're somehow connected?
Issue 1:
Since doing the original install last fall, I'm on my second 10lb residual pressure valve b/c, no matter how hard I tighten the fittings, I can't keep the fittings on either side of the valve from leaking. On the first valve, I thought maybe I had done a bad flare on the new, incoming brake line. Or maybe I somehow cross-threaded the fittings. So I took it all off, made a new line paying close attention to my flare job. Put in a new valve and made sure the fittings went in nice. And still, same leakage issues. I am cranking the fittings very tight. I'm afraid if I go much farther, I'll strip them out. Would teflon tape be the answer? (I don't think it would, but...)

Issue 2:
I have a soft pedal when the car's cold. Probably 2" or so of travel. But after I drive it around for ~30mins, the pedal becomes almost hard as a rock, there's maybe 1/2" of travel at the most. Seems to me, if that residual pressure valve is leaking, I'd have a soft pedal as I drive around??

'68 Biscayne
406/TH200-4R/3.42-12 bolt
12.06 at 113mph
The Cayne


 
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