Join Date: Jul 2006
Location: Sammamish, WA
Bikes: Cannondale Prophet, Specialized S-Works SL2, Specialized S-Works Stumpjumper
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What brakes are on the bike? Generally, rotors and calipers setup the same way regardless of manufacturer but it may still help to know who made your brakes.
Get your bike in the stand so that you can spin the wheel and listen for any rubbing noise coming from the pads. If your pads are rubbing loosen the caliper, spin the wheel and then stop it with the brake lever, and retighten the caliper bolts without letting go of the brake lever. Spin the wheel again the rubbing noise should be gone but if not repeat the process. If your pads aren't rubbing check for debris embedded in the pads, make sure the pads don't appear to be contaminated with brake fluid or cleaning products, and check that they aren't worn past their service limit. Check that the pistons are moving when you squeeze the brake lever. On your rotors, use a rag and some alcohol to clean away any oily residue that might be there. One thing that I've heard from a number of people now is that some manufacturers have organic pads that wear faster but are quiter so that may be an option for you to try. Finally, brakes are going to make some noise even under the best of conditions. Get them wet, muddy, hot, cold, etc. and they're likely to make a lot of noise. After a few rides you'll come to recognize good noise, bad noise.