In-good-condition ATE master cylinder for single brake disc setups. Came from a well-cared-for '77 R100/7 with 43,000 miles on it. Fits all /7 and all /6 with single ATE disk according to Max BMW Fische. Selling because I'm doing the brembo front-end conversion. http://www.maxbmwmotorcycles.com/fiche/PartsSearch.aspx?parts= 34 31 1 234 381 Shouldn't need a rebuild. Could use a nice cleaning with a brush and some de-greaser though. $125 shipped. Will ship same/next business day from San Francisco. PM if interested.