FN2 rear brake caliper wind back issue

[ChrisEP3]

Tried to change over rear brake pads on my brothers fn2 but no matter how much I tried the piston would just not wind back

I used a proper wind back tool but would go back so far then just stop

I loosened bleed nipple to release pressure right up to the point it fell out, and still wouldn't budge

Any ideas? Any special way that's out of the ordinary?

Also one of the 4 pads on the rear is down to the metal where as the other three are all 60%, what could cause this?

 

[Neily03]

Seized piston, or you're turning it the wrong way.

 

[ChrisEP3]

Tried it both ways

Got some more bits to retry tonight, hopefully should fine

 

[DAVE-T]

Did you take the top off the fluid reservoir?

 

[ChrisEP3]

Yea cap was off

Managed to get them done tonight, once the caliper freed up it was a doddle

Some penetrating fluid left to soak in freed it up