I do not know who replaced your caliper. If it was done by a professional brake shop, I'd expect they would have made sure that the caliper was free to slide on its pins. If the pins show signs of corrosion, most brake shops would replace the pins.

But if this was not the case, and the calipers were replaced without paying attention to the pins or the proper lubrication of these pins, the caliper can stick and cause uneven wear between the inner and outer pads. Also, rotor problems may develop since most of the braking effort is happening one side of the rotor; the rotor is being forced from one side and it may flex a small amount.

Excessive brake drag can occur if the fluid pressure is not relieved or the piston seals are sticking and not allowing the pads to retract. There are no return springs in the caliper piston. A small amount of relief is obtained by the flex action of the seal. With the brakes off, the pad do rub gently on the rotors and may release completely by the return action of the piston seals.

I assume that when the calipers were replaced, a complete caliper with pistons and new seals installed were used. And I assume the brake lines were bled.

If all these bases have been covered and the brakes still have excessive drag, look elsewhere for the problem. Find out why excessive brake fluid pressure exists with the brakes off.

Make sure the brake fluid is of the proper type and free of contaminamts. Brake fluid will readily absorb moisture from the atmosphere. Water in brake fluid can cause big problems with a potentail of brake lockup under hard prolonged braking. Moisture can flash to steam when the calipers go above the boiling point of water.