Do you have a 5mm allen key? You can loosen those bolts that hold the caliper in place and re-align it. It seems like one of the pistons are sticking a bit too far out and is constantly making contact with the rotor. If the rotor was warped/bent, it would make an audible *zing* at constant places in the rotor rotation. Try to bring your ear close to the caliper and try to hear if theres a constant rubbing or a zing.
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Do you have a 5mm allen key? You can loosen those bolts that hold the caliper in place and re-align it. It seems like one of the pistons are sticking a bit too far out and is constantly making contact with the rotor. If the rotor was warped/bent, it would make an audible *zing* at constant places in the rotor rotation. Try to bring your ear close to the caliper and try to hear if theres a constant rubbing or a zing.