The emergency brake has seized up and needs to be released.
On a drum brake setup, the parking brake is integrated with the service brakes. If the parking brake has failed, other parts of the rear brake system will also require replacement as the same part may be used for two different jobs. I would recommend starting with a rear brake inspection performed by a qualified technician to assess the damage. Once the correct repair parts have been determined, have the brakes replaced as soon as possible as brake problems can lead to safety issues.
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