when braking, my front avid brake has uneven braking. Seems like if it were a car, the rotor was warped and would need to be re surfaced. So I took off the rotor, cleaned, sanded down, and cleaned again, re installed and torqued properly. I was good for about 1/2 mile and then started again. The rotor is as straight as it could be, but I'm out of ideas on whats causing it, unless there's an area in the rotor that just slips more than 90% off the rest of the rotor. I didn't check the pads, because they work fine on the other 90%. I don't feel anything in the lever.