Park Brake shoes
Most Chevy Tahoe's & Silverado's from 2000 up have a one piece design park brake shoe. And, it seems to break apart a lot. It's really not a big deal to replace. It may look like the park brake shoe won't come off without taking off the axle, but it will. Be sure to check to see that the backing plate is not rusting to pieces, that's a common problem too. To change the backing plate the axle will have to come out. As long as your backing plates are good, just change the shoes.