I have read morer information (in German) now and it seems that the amount of cases where judder is caused by areas of different friction is huge. I will have a look if I see marks on the discs caused by the brake pad, as this was the case after the examination of the second change of discs. I now have learned among other infos that it is very important to run in new brakes and pads to put an even film of the pad material on the disc's surface:
Brake down from 60 mp/h to 6 mp/h in a bundle of sequences, never stop rolling, allow to let the brakes to chill within the trials and brake with rising force from one attempt to the next one.
Unfortunatelly I did not do so and this is new knowledge to me.
Also it was warned to stay on the brake pedal when idling after having done a sporty drive with hot brakes.
A different issue that if someone changes the discs on an hub, it will cause strong judder if the hub was not smoothed totally even, any rust has to be taken away even if it is only 1/100 of a 1 mm prominent.
Last edited by Heinz; 17/03/17 11:51 AM.
