If im not mistaking, there is a seal in the caliper behind the dustboot. That keeps the hydraulic fluid from leaking out, and keeps it moving the piston. But it also has another important function - it acts like a spring to pull the pads back away from the rotor. As that seal starts to age, wear, and stretch, it will loose its ability to pull the pad back effectively.
Im not sure what all gets done in a caliper overhaul, but you may still be able to use your old one. Get a new seal, dustboot, and clean up the piston/cylinder, and it may work just fine. Id look into the option of using the old one(mainly what went wrong with it) before buying a new one.
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