How to fix disc brake rub noise on a mountain bike or any bicycle fitted with disc brakes? The problem could be due to poor alignment. Follow these simple steps to fix it,
1. Use an allen wrench to loosen the bolts that hold the brake caliper to the frame so that it can move freely.
2. Hold the brake caliper against the frame so the surface areas touch uniformly, and squeeze the brake lever to keep it in place.
3. Tighten the bolts while holding the brake lever.
4. Release the brake lever, spin the wheel to check for rubbing noises, and repeat the process as necessary.
Tip: If your disc brake rub noise only occurs once or a few times per revolution rather than constantly there is a good chance your disc rotor is bent and it needs to be bent back into alignment with gloves or a clean cloth and wrench or rotor truing fork, or replaced (replacement is easiest).
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