I am in the process of putting on new rear brake pads and I noticed that the rear outside pad on the driver's side is worn very thin as compared to the other pads and I had difficulty removing the thin pad because the piston is frozen. I cannot pry it back. Use some WD-40?

Is it possible to save this caliper?

Thanks.

__________________
Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra