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It really is!
The brake is an Avid BB7 SL. Power is good. It can lift the rear wheel at slower speeds.
As I said earlier, the movement is between the rotor and hub.
The quick release (bolt on skewer) is tight. I don't think it has anything to do with the issue.I ordered a new rotor (TRP TR-25) to see how the fit compares to the Shimano rotor.
I also ordered some Loctite 638. That should fix the issue if everything else fails.
wenzovic
It’s frustrating that we can’t get to the bottom of it :(
My final suggestions: loosen the Quick release axle then do it back up, but to the point it only takes light pressure to push the lever up but still clamps the wheel in the fork.
Check if the issue gets worse with the quick release fairly loose. Then go to the other end of the spectrum, try get the quick release clamped as tightly as you can and see if the issue goes away.
The only other thing I can think of is checking that the brake is actually operating at its full potential. Is it a hydraulic brake?
Are you sure that it’s properly bled and has full power?
Can you lock the front wheel from a moderate speed into an endo/stoppie?
Have you tried switching the Rotors around? If you put the rear rotor in the front, does the issue persist?