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it sounds like the seals are gone in the master cylinder, as you operate it is supposed to stop pressurised fluid passing back only when pressure left off. if every other thing you have tried has failed sounds like the seals. should be able to get a rebuild kit.
when piston is back there is no pressure so piston goes out. when it hits the disc the seals keep the pressure on.
Last edited by wheelers; 29-10-14 at 10:09 PM.
Thanks for the thought, I've rebuilt the master cylinder using a kit and everything seems to have gone back as it should and all the bits were the same as I removed, no leaks or other concerns. My thoughts were the same as yours initially so I went with the kit. If I couldn't achieve the right feeling with the piston back in the calliper I would strip it again and check the assembly etc... but I guess it wouldn't work by creating any pressure if it wasn't working.
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