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Yeah, you basically hold one piston in while pressing the lever to advance the stuck one and clean it. (Be careful, you don’t want the piston to pop out completely!)
This park took video explains it wellhttps://m.youtube.com/watch?v=vQXFFgRButo
https://m.pinkbike.com/news/tech-spotlight-brake-caliper-piston-service-assessment-2014.html
TotalShanner
@atz
Ultegra r8000 series calipers. One piston seems not to be moving. Anything I can do to sort it?