I have a 2003 M3 driven twice on a track to test new tires and for the fun of it. After the first outing I noticed considerable vibration in the steering wheel when brakes are applied and then after second track day it was much worse. I have been told that it was irregular brake pad deposits, parking the car with wet brakes (dealer diagnosis) and warped rotors. I did remove the wheels and noticed that the right front rotor seemed to drag a little bit when turned through the calipers. I would like to be able to drive this car few times a year on a track. I don't mind spending a few bucks curing this problem so it won't happen again, even if a big brake kit would guarantee a fix. It sounds like this can, however, create another set of problems that I might not want to deal with. I would appreciate any suggestions that might cure this problem. I have been told that the stock brakes are not satisfactory for heavy repeated usage on hot days. Thanks