Hi again all, since my last post, I have bypassed the equaliser valve on the advice of the knowledgable Bernard le mecano. Only different thing I did was rather than just replace the tee's for elbows, I made an equaliser manifold in the lathe so that the brakes are permanently equalised (as I have the pedals bolted together due to a worn pedal shaft and I figured that if the brakes were unequally worn I would get unbalanced braking without equalising the pressure in each service). Apart from a small leak on one pipe, I thought this would do the trick. However, after bleeding the brakes all was good, engine stopped for about 30 mins & still good, engine off & pedal remaining hard, left overnight and back to soft peal and pumping the brakes again!!!!!. I just don't know where to next, should I replace the seals in the master cylinders? even though there appears to be no leaks. I still don't think it's the wheel cylinder seals as when they work, they are perfect until the engine is stopped, if the wheel cylinder o rings were rolling, surely they would do this whether or not the engine was running?? It seems to be something that is affected on the engine start up, as sometimes I start up and all is well, other times it's not, I'm on the point of giving up!!! Please help..