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How recently have they been changed? If you're not sure, I would check the pads still left on the and change them. If it hasn't been very long since they were done, you can go to your local auto parts store and buy some stuff to spray on the back of the pads that acts like a dampener to quiet the vibration against the caliper which is usually amplified by vibrating against the rotor as well. Used it quite a few times on cars and it works great.
How recently have they been changed? If you're not sure, I would check the pads still left on the and change them. If it hasn't been very long since they were done, you can go to your local auto parts store and buy some stuff to spray on the back of the pads that acts like a dampener to quiet the vibration against the caliper which is usually amplified by vibrating against the rotor as well. Used it quite a few times on cars and it works great.