Have A Burnt Plastic Smell From Left Rear Tire And It Is Hot As Hell What Could This Be

It only happened on the left rear tire on my Explorer 05. It smelled like burning plastic and there was a lot of heat coming off of it. What might this be ? I check the E-brake and it was not engaged. I got underneath to check the exhaust, no holes or smoke. I’m clueless form this point on. It is coming off of the brake mainly

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