brrake rotor grooves
 

I have a 2016 A6 with 8000 miles of gentle use. The brake rotors have significant grooves in them. Anyone else faced this? I can hardly believe that a $65k car can need new rotors this early. Secondly, I have the 3.0 motor and there is a significant lag when hitting the gas to merge with traffic. Not being picky but the lag has been dangerous to a point where the delay almost cause me to get hit.