Your mountain bike brakes may be squeaky due to dirt or debris on the brake pads or rotor, or due to misalignment of the brake pads. To fix this, you can clean the brake pads and rotor with rubbing alcohol or sandpaper, and adjust the brake pads to ensure they are properly aligned with the rotor. If the issue persists, you may need to replace the brake pads or have a professional inspect and service your brakes.
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