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I had this same problem, I don't remember how it got fixed as I changed all the parking brake shoes and basically reset the system. The issue was that if I pulled the brake lever to the upmost position (brake was very weak before), the release button would lock up. To release it I had to pull the lever upward and push the release button as hard as I could. It really took extreme strenght to push it. My dad pushed the button as hard as he could while I yanked the lever up and we managed to release it.
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