I have recently rebuilt the rear brake caliper on a mates GSX600F, new seals etc. When the caliper went back on the bike and I bled up the system I found the the rear brake was binding on.
I have removed the caliper again and check that all is well, but it still binds on when I bleed it up. If I try to push the pistons back into the bore they won't budge, it's like they are locked in place. The only way they will move back in is if I open a bleed nipple.
I have today fitted a replacement master cylinder and still the same problem! I am wondering if the brake line is collapsing and so a new braided brake line is on the way but in the mean time I thought I would post here for any other suggestions??
Thanks in advance!