Hello,
Had an issue with my rear caliper kind of sticking, I could kind of move the wheel by hand but it didn't rotate freely, had a look at the handbrake cable that was only replaced last year and is fully retracting so that's not the issue.
Then I reset the piston, wheel spun fine then, then I went a for drive to test the brakes then jacked it up again and it was back to where it was sticky, difficult to rotate by hand, so I guess the piston isn't really retracting itself.
Any ideas? Cheers