Hey! I have a 400F, 76's (2 of them,) and rebuilding master cylinders rings a "distant" bell. This last rest period for 10 yrs in the garage, leaning on it's side stand, and bars cocked all the way to the right, a balanced stance. When the time came to breathe some life into the one, I noticed a nice trail going down a non dented factory red with original but signs of hard riding paint and decals from the leaky master cylinder line. Awesome! This thing "broke" while sitting, and I washed it right away, getting most of the fright in me to get a grip, and the streak is gonna be there forever. But what I did to fix it, was to take the M/C apart, with a ice pic to remove the c'clip, washed the dirt or corrosion out of it, relubed it with dot 3 brake fluid and massaged the cups a little, and put it back together like it was, with visible pitting. And cleaned out the piston and lines at the disc "slave" cylinder, and put it back like it was. It's working awesome. Any cute passengers of mine gets the rebuild story. The biggest thing here, I should of put it on a tips and tricks thing, but while in storage, keep in mind the little buggar can spring a leak, and cut a path right down the tank and through the decal.