Title pretty much says it all. Changing the rear pads and I cant push the piston in far enough, or at all, to get the caliper on. The bleeder screw was rusted in so bad that it broke off, so I don't want to have to crack any seals because I cant bleed it out. Any suggestions?

 

did you open the reservoir

 

So...you did a pad swap and now can't push the piston back...ok, normally, I ensure piston movement before slapping the new pads on. Sounds like the piston is frozen...which tells me a rebuild is in order, but, if not interested in that and only want to free the piston, I use a large C-clamp and one of the old pads to compress the piston back. Unless your master is 100% full, it should go back...if your master is 100% full, pop the top and use a syringe to get some out (compressing the piston will force fluid back to the master)...brake fluid is tough on paint...so don't just let it spill everywhere.


Now...don't expect long life from these new pads, as your piston froze for a reason...and will probably freeze up again...