I had a phone call from them about these rear rotors... They told me that there is no any signs or evidents for faulty materials from the centrals.. Also when i told them about this forum and that many people have the same problems, he told me this clever answer: "sir, in these forums its like you go to a hospital...anyone who had never no problems wouldn't write there.. so if you read all this stuff you can think that this car is faulty but its not like this..." finally he tried to persuade me that there is no matter of security with this rust and if i like to go to the dealer and make some measurements on the brakes... Of course i will do this , but i am not still convinced about the quality on some parts on this car....
Cheers