If it sticks when it's hot it sounds like an air bubble in the system somewhere. What are you running for fluid? Dot 5.1 is the norm these days and is not compatible with Dot 3,4,5 or anything else as I understand. Not available at Napa or Autozone. Motorcycle specific. Could be a mix of fluids that's giving you a problem too.
98 uzj100. Factory rear-ARB front locked 4.88's. ARB Bull, Warn 9000, Irbis rear bumper, Slee sliders and belly pan. OME t-bars w/863 rears, HID, XM