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The nut at my brackeplate was already tight. In my case the gap between pin and hole in the frame was the reason for the Noise. Have a nice weekend.

Hi Lars,
Today i removed the rear wheel and i put a heatshrinking sleev on the 10mm pin, which is holding the brake in the frame.
After this there is no „Klack“ sound anymore. It means, my problem is solved. hope it will solve your‘s too. Good luck.

Just to find the source of Noise i will fix temporär a shrinksleeve. Also i will disconnect the rod from gearbox to the brake. Then i can be shure the Noise is comming von gearbox or rear weel. It will take time, i am a old man.

Hello Lars,
I have the Same Klack Sound and i am surching since a couple of day for the reason. Sorry for my english! Tomorrow i will try to minimaize the gab between the pin and the Frame. I think this is a good idea. I will let you now the result.
Rainer