I lifted the front end up lastnight and noticed when I spun the wheel the brakes would grab about 1/4 of the rotor and the other 3/4 spun ok. I took the calipers off and spun the wheel but cant see that the rotor is warped. The brake pads look fine, even wear on all pads, so I dont think a caliper is sticking. Would the rotors warp after 9k miles, and what causes them to warp so easy, I am not that hard on the bike and I really take care of it. Would this also effect handling, especially when coming to a stop,I noticed the bike wants to wobble left and right.