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Your have a broken E-brake handle/ratchet... you will need to replace broken parts either by dealer or call the Kar Shop (forum vendor) for used parts.
When your setup is working again you can adjust the parking brake shoes by removing the rear rotors as others here have mentioned.
Hey Nolag, you may want to call your dealer on this, some body posted a thread a while back and said that this E brake problem is a safty issue with GM and should fix it for nothing