I recently built a bike with Avid BB7's and after riding the bike for about 20 miles, my front disc brake started chirping when braking. I've ridden the bike for over 200 miles now and the front disc still chirps when braking. The rear disc never makes any noise, practically silent, though I do admit I haven't used it anywhere near as much as the front disc.
The front disc brakes very well, the noise seems to be the only problem. I've re-installed it to make sure I didn't do anything wrong but the noise persists. Does anyone know what the problem might be, or is this normal?