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I just got a Rockhoppper comp disc. Not ever having disc brakes before I noticed a hissing noise coming from the brakes. Is this just a break in period thing or normal for disc brakes to do? Thanks
 

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Meh.
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Metallic or semi-metallic pads on steel rotors. It's pretty normal to hear it while you're braking. If you're getting it all the time, the brakes weren't set up right and need to be re-centered. If you want to dampen the noise, organic or sintered pads typically make a bit less noise.
 
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