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Originally Posted by JohninFla
His idea of the mechanism where the caliper could damage the rotor is for the piston to remain extended, and not retract after braking. This would keep the pads in contact with the rotors, causing overheating and warping. It actually sounds reasonable to me.
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Well, the pistons do not actually "retract". They lightly contact the rotor at all times, and, when pressure is added to the caliper, they are forced against the rotor.
Jack up the front of the vehicle. Take the wheels off. Step on the brake pedal firmly and release. Rotate the rotors by hand. If they spin with light contact between the pads and the rotor, his idea is incorrect.
If they will not spin by hand, then the piston is binding in the bore and the pad will overheat the rotor. However, in this condition, when you drive the vehicle you should feel a slight pull to the side with the faulty piston when you take your foot off the brake.
BTW, brake hoses can cause this exact same problem. So, if one of the rotors will not rotate, crack the bleeder screw and let the pressure off the caliper. If the rotor will now rotate, the brake hose is the culprit.