Looking for any experience w/ newer Audi brakes. Wife's S4 needed new pads and rotors at 23k miles and we were both a bit surprised. Brake warning light came on, fluid was fine but the pads were very thin; 3mm or so. Dealer said it is normal for these cars(!).... Her commute is all highway and we got ~70k for the first brakes on her 535ix before that so pretty sure it's not driving technique. Thinking that brakes at this mileage is a bit ridiculous....any others out there?