Muscle Car Research is proud to offer a rebuild kit for the GM 3523171 (ACDelco part number 172-2175) combination brake valve used on 1991, 1992, and 1993 GM B-bodies (Buick Roadmaster and Chevrolet Caprice) with power front disc and cast iron rear drum brakes (RPO JM4). Our kit contains most of the parts needed to rebuild your leaky valves and return them to "like new" operating condition, including o-rings and a retaining ring. For now, the "top hat" seal needed to rebuild the metering valve component is NOT included, but I'm working on a reproduction of that seal, too. All of the rubber parts are molded from a 70 durometer ethylene propylene diene monomer (EPDM) rubber compound that is fully compatible with automobile brake fluid, and all parts are made right here in the USA!
Complete rebuild instructions will be available soon. Dealer inquiries are welcome - please contact us for pricing.