Join Date: Apr 2010
Location: Forked River, NJ
Bikes: 1973 Peugeot UE-8, 1985 Schwinn Voyageur, 2010 Trek 1.2, 2012 Bianchi Siempre
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Its tough to say what's wrong with the brakes without actually seeing them. Best I can do is give you some things to look for when you go view the bike:
1. Specifically, which brake is "broken"? Is there any sign of physical damage?
2. Are they really "broken", or does the bike simply have poor stopping (replace brake pads and/or adjust brake tension)
3. Does one side of the "broken" brake always rub against the tire? (adjust mounting bolt and lubricate springs)
So, it could be anything from simple adjustments ($12) to replacing all cables and pads ($35) to replacing one of the brakes entirely ($40-ish).