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Bin them and buy any other brand…. Sorry.
Doing a piston advancement service can help, you can buy little 3d printed spacers that allows you to advance one piston at a time to give them a clean and help loosen them up. It can be a bit tedious, takes a bit of time to do all 8 pistons but it will definitely help.
The pistons might not be retracting fully and causing rub.
The process sounds worse than it is, it’s fairly simple but just takes a while.
There’s a couple clips on YouTube that show a run through the process.
TotalShanner
Anyone got any tips for maintaining and setting up Hope V4s?
Constantly find they need fettling with, and that they're incredibly hard to get evenly centred on the rotor. Pistons often drag too.
(Currently finding that I can't adjust the caliper inboard enough to prevent rubbing)