My problem concerns my 2007/57 Audi A8 3.0 TDI, which has covered 31,500 miles. Recently, the brake wear indicator flagged that I needed new front at rear brake pads, which I can accept, given the mileage, as this is consistent with the mileage I have obtained with previous vehicles. My issue is that, given that this is the first time that the car has required new pads, is it reasonable that the local Audi dealer also fitted new front discs? Apparently, this is regarded as a wear and tear item that, again, I can accept, but my question is, does this suggest that Audi A8 discs are only made of the same hardness of material as their pads?