Brake squeal is normally caused by pad vibration against the rotor and can usually be controlled by ant-squeal paste behind the pad. Sometimes changing pads to a different type or brand can help as well.

This assumes there was no damage that might be creating a squeal. You would also need to verify there is nothing else rubbing on the rotors, and that they and pads are mounted corrrectly and the pins are lightly greased and not corroded.

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