MD Safety Inspection
You may need rotors as the old owner may have just opted to put new brake pads on as it is much cheaper and he/she didn't want to invest in a car they knew they were trading it in soon. I replaced pads and rotors on my Audi S7 before I traded it in. I hated to do it, but my pads we low and the sensor was on, so it was necessary. Maybe your owners just did the least expensive thing they could do to get it ready for sale.






