O'Rings and Brake fluid - Page 2 - Chevy Impala SS Forum
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post #11 of 11 (permalink) Old 05-19-2019, 11:31 PM Thread Starter
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Join Date: Mar 2002
Location: Plano, Texas
Posts: 579
I finally found a bone yard in Texas that had a combination proportioning valve from a 2003 S-10 with relative low mileage(117k). I replaced the Master Cylinder and the proportioning valve. I am back to normal. I believe that the master cylinder was leaking internally and the proportioning valve was leaking out of the rear port.

I took apart the proportioning valve and only a single o-ring. The other portions are rubber discs. I need to see if anyone has the replacement discs to rebuild the valve and just put on the shelf for later.

Thanks for the insight.


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