Now, you can't compare a CX with a 4/4; everything is much more modern and innovative on the CX. I got three new brake discs for my 4/4 during the warranty period. Each time, it lasted 7000 km and the ugly wobbling of the brake discs came back... with an exponential increase to an absolutely poor and undriveable state. Then I changed the garage. The new workshop has mounted new brake discs. Then these new brake discs were tested on the car, they still had a very fine wobble. They were just ground, brand new, with a kind of diamond knife or something similar, when they were mounted on the car. I think it's called skimming. I have had absolutely wonderful smooth brake discs since 80,000 km. (On the 4/4, they literally last an eternity). I think that if I got it right, you have to skim the brake discs when they are brand new, because the slightest lateral runout quickly increases to the point where they are no longer usable. In my case, it worked.
