Parking brake not working on 2002 GMC Envoy

During yearly inspection was told car would not pass because parking brake was not working. I am wanting to get an idea of how much this should cost to fix.

Asked by for the 2002 GMC Envoy
There are many things which can cause the parking brake not to work correctly. I would suggest you have the problem diagnosed by a qualified technician. Once you know what is wrong with your parking brake we may be able to help with cost estimate.
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I have a 2002 GMC envoy how do you adjust the emergency brake it is not working