Just to clarify, your caliper piston were stuck/froze up?
Keep in mind that many times you will have a stuck caliper due to faulty brake lines that goes to the caliper.
What happens is overtime the brake hose can actually collapse on the inside and this will prevent the brake fluid to go back to the reservoir. Since the fluid cant move it will keep the piston to the extended position pushing against the pads and stuck. This will press the pads to the rotor and will damage the rotor and wear it prematurely. It will wrap the rotor as well. Typically this will generate good amount of heat.
Let me know you thoughts.
Saturday, September 11th, 2021 AT 8:00 PM