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.

2 answers
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.
I have a 2002 GMC envoy how do you adjust the emergency brake it is not working