I'm trying to bleed my 2012 SLX brakes and I'm failing. They keep pumping up noticably.
I'm fine bleeding most brakes - old shimano, older shimano, formula, magura - no problems. But can I bleed these? Not a chance.
I've followed the instructions to the letter, four times. I've checked the system multiple times and I'm fairly certain (99%) there are no leaks. I've got to the stage (several times) where I can't get any more bubbles of air out, and yet they still pump up.
So. There's clearly either:
a) still air in there (and idea where or how to get it out?).
b) Or someone has fiendishly emptied my mineral oil and replaced it with something else. (Could anything have happened to the oil? I didn't think it could absorb water or anything like that.)
c) Or I'm just being a total muppet.
Any ideas?

