A common reason for the brakes dragging are the pistons partially seizing in the caliper. It happens when the fluid hasn't been flushed regularly (maybe never since new), rust develops and the pistons start to seize. Only way to check really is to remove the caliper and see how easy it is to push the pistons back in, they should move smoothly and pritty easily, if there's any sign of corrosion under the boot, very dirty, rubber boot torn and maybe slightly moist from slight seepage around the psitons then that's probably your problem. If you are lucky, they may only need to be dismantled, cleaned up thoroughly and replace piston seal and boot.
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