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Hello. Most likely, your caliper piston is not retracting as it should causing the pad to constantly rub on the rotor. The other possibility is the caliper slide pins may be seized up not allowing the caliper to move in and out as it should. When you replace the pads again, make sure that the piston presses in easily. if it doesn't compress easily, replace the caliper. Also make sure that the caliper slide pins are not seized up and that they are clean and greased well. If you get a new caliper, get a loaded caliper. It will come with a new bracket and slide pins.