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I already measured it and the difference ist about 0.5 mm.
Also put a shim under the rotor for good measure to rule out any possibility of bottoming out.I'll stop spamming the thread now. Thanks for all the answers and suggestions.
In case that I'm able to solve the issue, I'll report back.
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?
TotalShanner
No gap just means it's touching, not necessarily pressing. Measure the thickness (A) of the rotor centre and the depth (B) from the face of the hub shell to the face of the shoulder. You'll want about 0.5mm difference to allow the lockring to press on the rotor properly before bottoming out