I have Ultegra brakes and race lite wheels. Recently I noticed a soft clicking sound at the front brake/wheel. Really more of a whoosh than a click. It only happens when I brake. It's like there is something that comes around and rubs on every revolution when the brake is applied. I've cleaned the braking surface on the rim thoroughly, and checked the pads as well, but I can't see anything. This phenomenon just started. All I can think of is that I recently re-centered my brakes using the allen adjustment on the top of the brakes.
Does anyone know what could be causing this sound, and should I be concerned? I have a race this weekend.