Guys,

On my Surly Pugsley I have BB7 brakes with 203mm discs both front and rear. They are generally fine – other than when the usual mud, sand and other debris accumulate – but when riding at higher speeds, often when coasting downhill, there’s a hideous scraping noise, I assume the discs are rubbing against the pads. This does not happen at low speeds, only faster speeds. Does anyone have an idea why this is?

Gary
http://www.pugsley-on-patrol.org.uk
http://www.youtube.com/user/garybuckham