Got the proportioning/combination valve back from one of the Performance Years website members, 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. Even the leftover, half a bottle I still had on the shelf, turned the same yellow. 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:
11-12-2010, 01:54 AM
Re: 72 TA : New Project
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