Going to be installing new brake pads soon and was just curious if it is necessary to replace or do anything to the rotors? My pads are not totally worn yet so I have no grinding going on at this point and no issues with braking. I would just like to replace them before they become a problem. I'm going with the Hawk HPS pads. Can I just throw them on and leave the stock rotors as is? My car is only street driven if that makes a difference. Thanks.