I am going to assume you have rear disc brakes just because if you have rear drum then the parking brake is part of the rear shoes. However, if you have rear disc brakes then the parking brakes are inside the rotor. A lot of times these get hung up and will start dragging and making noise once they are worn out. I would suggest pulling the rotor off and looking at the parking brakes to see if that is the issue.
Images (Click to enlarge)
Tuesday, January 7th, 2020 AT 5:09 PM