I've serviced the rear breaks after the pedal went soft and went to the floor requiring an extra pump to get it hard. I thought it had fixed it as it went back to the way it should be. But it only lasted a month before started to do it again, I could not see it leaking at the rears. So I serviced the master and remote servo. I found in this case I only had to bleed it at the front to get a it back to a hard pedal so no air in the rear system but this time it only lasted a week. I've now found that it does not matter which of the three bleed locations I use either will get me back to a hard pedal, it now only lasts a few miles so is getting worse. This leads me to think the air is getting in before the system is split. I'm 100% sure that the master and remote servo is good. I have now noticed that the flex pipe from the reservoir to the master cylinder is now leaking a little, is it possible this is where the air is getting in? My only other candidate is the brake switch, this does not look as if it's leaking. If it's not these then I'm at a loss.......