Thought i would bring this thread up again due to having just experienced the exact same thing happening to the shoes of my parking brake.
Having just had new tires put on my Jeep (Commander 2006 Hemi) I realized i needed new discs and rotors up front. rear did not look bad except one side was not engaging across the whole surface of the disc.
Popped the wheels to inspect and had a read hard time with trying to get the rotor off. Ended up buying a 2 point puller (6 inch jaw length does it) got the rotor off and discovered both shoes linings had come detached. Still in one piece. Looks like weather in Canada got to the shoe over time and rust has crept across the surface under the bonding. Not happy but what can you do.
Also discovered that on prior brake change the pin lube i used (some supposedly break grease ...NOT) had dried out and was acting more like glue than lubricant. Hard to believe. The hardware kit for the disc pads contains new metal strips to go across where pads rest and ride and this strip was badly rusted causing breaks to bind. Between that and the pins not moving this brake was not playing its part at all. That was on one side at rear, popped other side and exact same situation.
Wanted to say don't just check how much pad is left when inspecting the rear discs, its highly misleading. Wheel needs to come off and rotor needs to come off for full inspection.
Hardware kits are available to replace pins boots and bolts and if necessary the runner strips too.
I was lucky in that i did not have the parking break shoe linings end up breaking up and getting jammed in places like mentioned elsewhere.
And for the record the rotor/pad combinations that have really worked well for me on this Jeep and lasted have been the Raybestos Advanced Technology ones. Not easy to get hold of in Canada at a decent price but the ways and means committee has its way
In future i will order shoes with the new pads and rotors when i do a brake job which now hopefully is not for a good long time.
Oh and hardware kits too, we get totally ripped off in Canada for items like this. Paid $44 for parking brake hardware kit.
My thanks to the person posting this thread in the beginning helped me a lot to know I was not alone when i discovered the linings loose.