TR2 has such a simple system and still I can't figure out why pressure builds up until brakes stay on. For the moment I have an emergency solution, as I had an aftermarket brake servo installed, (and did blame it for the pressure build up and removed it) there is a bleed nipple in its place. When I feel the pedal getting lost of play, I just have to bleed the system just a few drops, and I can drive on. I have just 5 year old brake hoses, and just a week ago I replaced all the seals in the master cylinder. I also checked the non return valve in the master cylinder, and it seems to work. What w