Originally Posted by J.damone
..... Looking closer at the side that I removed it feels like the rotor wore the shoe in such a way that it has a lip that hangs on to the rotor on the inside.
If you're referring to a "lip" on the edge of the rotor, where it passes over the p/b shoes, I'll toss this out for discussion.
In theory, your p/b shoes shouldn't ever wear out, because you don't use them to slow the vehicle, during normal driving. They're primarily there to back up the transmission's "parking pawl", when the vehicle is stopped, by applying force to the inside of the rear brake rotors.
From what I've read, on a couple of Corvette based websites, since Corvettes have a similar system, is that that "lip" sort of acts as an "adjustment gauge" for setting the p/b shoes. You expand the shoes until the rotors are a tight fit over the shoes, as defined by this lip, then when you slide the rotors in place, the gap between the shoes and rotors is correct. At least that's my interpretation of what I've read on this topic.....