Does anyone have any ideas/experience/ suggestions on where i can get a new rear master brake cylinder for my 2000 Chief? Shop has tried rebuilding twice, bleeding, checking for leaks, but still loses pressure. At 700 lbs, i need a rear brake, haha.. Have ordered 3 different ones from JP, Kjuryaken, Drag Specialties, but all too fat!!! Quit making in 2015 according to numerous sites. Any thoughts please???