Brake pad drag.

[Wingsconsin]

This may work...

I have had success unsticking a piston that was badly stuck...
The air wouldn't pop it out...so I used a clamp (woodworking style) and put presure on the piston to go back in...
Once you get it moving a little bit -- it will eventually pop out with compressed air...
But mind where your fingers are! The last one I did flew across the room as the popsicle sticks (2) of them fell out of the caliper and didn't stop the piston from popping out with force...

[spyug]

Well I did get them all cleaned up and working as they should so that's one less worry. And I made a big mental note to never believe anything I maybe told or hear and always check things over myself......especially brakes.

thanks for all the input folks.

spyug

[Crankthat]

The pin mentioned in the earlier post always needs a good cleaning before applying grease.
I lightly engaged mine as you would a bit in a drill and used a green dish scrubby while turning it with the drill.
Worth checking that the pins are not warped by rolling on a mirror and checking.