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teileklaus
Yes, I have Zimmermann rotors, and so far, the noise has only occurred where there are holes in the rotor... it's probably due to that.
I foolishly broke the cuff, so it's not brittle.
"But I was planning to repaint it anyway, especially since you don't need any special tools for that. My parts supplier is giving me a gasket set with all the seals that are used in the saddle (according to him)."
Thanks for the instructions. The brake caliper looks quite similar, so it's probably the same system.