Rubber Compounds and Fluid Compatibility

When faced with a leaking brake valve, many adventurous home mechanics follow the same path I did and wonder if it's possible to rebuild the valve. Many valves can indeed be rebuilt, but it's important to understand that it can't usually be done using seals found at your local parts store. That's because the Nitrile/Buna-N or Viton (a fluoroelastomer) rubber compounds used in o-rings and other seals found in "over the counter" kits aren't compatible with automotive brake fluid - they're designed to be compatible with petroleum-based fluids like engine oil and gasoline!

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1996 - 1997 Ford F6SC-2B091-CA Proportioning Valve Autopsy

This brake pressure proportioning valve (Ford calls it a "brake pressure reducing valve") was removed from a 1997 Ford Thunderbird. It is marked "F6SC2B091CA"; the service part number is F6SZ-2B091-CA. Original applications include the 1996 and 1997 Ford Thunderbird and Mercury Cougar. You can click on the pictures below to see larger versions of the images.

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1970 GM 3983040 Pressure Distribution Switch Autopsy

This Weatherhead brake pressure distribution switch was removed from a 1970 Chevrolet Camaro. The original GM part number for this part is 3983040. I have not found any references to this part being used on other GM vehicles; please contact us if you know otherwise. You can click on the pictures below to see larger versions of the images.

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New Site Search Engine

I just finished implementing a new search engine on the site that will hopefully do a better job of finding content. You might also notice a new "Did you mean?" block that lists other content related to the page you happen to be viewing. Happy searching!

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