Cables stretch.I am not 100% certain but I do not believe you need to adjust the parking brake. Once the rear pads are changed, it should automatically adjust. It is not like the Gen 1 where rear shoes need adjusting.
My Colorado has a adjuster about half way along the frame. It connects the front cable to the back cableS.
No idea on the cruze.
Don't use a lot of pressure and the cables won't stretch.