Hi all - In the middle of an epic trip two summers ago, my front brake started stuttering. I can't point to any particular moment or incident that might have caused it. It is chafing at a certain point in the rotation of the wheel. I notice it most when slowing to a stop. Chunk, chunk, chunk...chunk...chunk......chunk......stop. The brakes are functional, just not smooth. It looks to me like the rim is spinning true. I took off the rotor and it appears perfectly flat all around when I check it with straight edge laid across. I tried a different axle. No change. Any suggestions?