Hello together, have waited longer with this question to find the cause itself, however in vain. And indeed my disc in the 5F Cupra MJ 2015 sporadically from the inside. There are proper drops forming which run from above. So it is at least not a little. Over night the vehicle is always in a well ventilated garage, there is at least nothing formed. What I have always noticed is that after a rainy day the next day, as long as the vehicle is in a well ventilated garage, nothing is formed. air conditioning is rare with me. Therefore, I close the accumulation of condensation water there. It never attacks zb when the vehicle is in the garage. Where could I look for the cause? I’m perplexed. Would be grateful for any idea.