Bendy toy
Registered user
Make yourself a clamp from two strips of 3mm x 25mm steel and 50mm M6 bolts. Put a block of wood between the moving pistons and clamp across the third. When you pump the lever the last piston will be pushed out.
With the caliper off the bike you will hopefully be able to remove the easy pistons with a tyre stirrup pump (easy fast pressure). If not, clean the removed piston and its seals. Then swap the clamp to the cleaned piston and use the hydraulics and wood block to shift the next one. Doing that will change the fluid and shift the stuck pistons.
With the caliper off the bike you will hopefully be able to remove the easy pistons with a tyre stirrup pump (easy fast pressure). If not, clean the removed piston and its seals. Then swap the clamp to the cleaned piston and use the hydraulics and wood block to shift the next one. Doing that will change the fluid and shift the stuck pistons.