1970 - 1971 Mopar Metering Valve Rebuild

This document describes how to rebuild the 1970 - 1971 Mopar 3466156 and 3466157 brass metering/hold-off brake valves manufactured by Kelsey-Hayes using a new seal kit available from Muscle Car Research LLC. The same basic part was also used on 1968 - 1969 full-sized Ford police cars and taxis (part number C7VY-2B161-B), 1970 - 1971 Ford Galaxies and Thunderbirds (part number D0AZ-2B161-B) and 1968 - 1972 Ford F250 and F350 trucks (part number C8TZ-2B161-A). Tools needed:

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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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