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I just got a new bike 2 days ago, it's a specialized hardrock disc, and it has a squeaky back wheel, I have traced the sound to the disc brakes on the back wheel, there is no reason for them to be bent, however, i notice that on the outside, is an orangish color, while the flat parts are silver, but the front ones are all silver, what are some possible reasons for this squeaking, and how to possible fix it. My friend says that it is made of carbon steel so when it's hot (like it was today) it shouldn't be effected by water that was splashed on it (like it was today)