Need some tips on replacing a Bad Brake piston gasket - any ideas?

invalid@example.com (Brainsprain), Brainsprain
Fri, 13 Mar 2026 12:52:57 +0000
RT Shop Talk

I was trying to replace the rear brake pads. Looked like an easy fix. Well, not so fast. First, I noticed what I assume is a dust dirt gasket was deteriorated. I tried to turn the piston back into place. I couldn't do it. Questions:
1. Where and what do I buy the gasket replacement?
2. I may need to put more pressure on it. I do not think it came unthreaded, but it won't turn. A little CW but only a little. I've worked with it with WD 40 and Brake cleaner. Any ideas will help.
3. If I cannot...