04-02-2018, 12:07 PM
I wonder if it's worth winding the piston in a bit (rotate it clockwise by locking a flat tool of some kind between the raised parts of the piston) to see if that frees it up? (The piston is attached to a threaded rod which is part of the hand brake mechanism).
You could also peel back the bottom of the piston seal to see if there is any fluid leaking past the bore seal. If it is then a rebuild or a replacement caliper is on the cards.
You could also peel back the bottom of the piston seal to see if there is any fluid leaking past the bore seal. If it is then a rebuild or a replacement caliper is on the cards.