There should be minimal drag on the rotor with the brakes not applied, it does sound like the brake hose has failed internally which holds the brake on. Here is how you can change the brake hose out in the images below. Also, I have included a video of how to bleed to brakes. If there is a drag on the wheel open the bleeder to see if the wheel will turn this tells you for sure it is a pressure issue.
https://youtu.be/w7gUsj2us0U
Check out the images (below). Please let us know what happens.
Image (Click to make bigger)
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Thursday, September 22nd, 2022 AT 10:34 AM