Has that brake fluid ever been changed...? Yikes. Looks like a ton of moisture.
Would like to see some more detailed pictures of the bore and piston. Thanks for sharing.
Can we make a confirmed list of items for a full piston/seal kit, then let's request a sticky. @2001LC would you be willing to circle?
This is strictly for piston/seal rebuild, but including problem area's like new screws for the motor electrical connectors, common disintegrated boots, etc.