I have a 09 4wd v6 with third row. 20,000 miles. My back brakes are disk. The parking break is weak and I'm unsure how it works. To keep it on a hill I need to pull it all the way ( maxed out). Is the parking brake in the disk caliper or is there a drum break with the disk brake? With only 20k I can't imagine needing new pads. I could use a diagram of the back brakes w/ parking brake assembly. I thought I had seen one on this form but have yet to find it.