I have search as many forum as I can find and no where have i been able to find out how to change the parking brake system on my 2008 Suburban. I did figure out (I think) that there are no adjustments that can be made. so i figure somewhere there is a hidden brake system that needs to be replaced.

I use my parking brake out of habit because I tow a large travel trailer and park on hills and find it much easier to shift out of park
Thanks for any help