Gen 1 leaky rear master cylinder

[Lez72]

All of the above makes perfect sense and I too thought I would have to have been unlucky for the master cylinder to have failed when it did but I wondered if it had occurred due to me pumping the pedal a kazillion times whilst trying to bleed it up. Prior to reading all of the above I have took all the rear brake components back off today and stripped everything down including the master cylinder and rear calliper to see if there was anything obvious amiss. There was some brake fluid residue in the rubber boot on the master cylinder but all the seals and plunger look ok. I guess its hard to tell if a seal is not seating right or is worn but there didn't look to be anything obvious. Anyways, I have cleaned and blasted everything through and the master cylinder boot is now dry as a bone. I am going to get 2 new bleed nipples tomorrow and then put it all back together and give it another go as I think one of them might be seeping slightly.

Thanks Male Whale regarding the tip on how to check the efficiency of the MC. I like it  8)

I'll post again when the issue is solved. Thanks again guys