So, that was fun. It wasn't the fronts at all. I was turning the car around in the driveway so I wouldn't be working in a mud puddle, and could feel a hard clunk when tapping the brakes at 2mph, and realized it was coming from the rear.
Pulled the passenger rear tire off and was greeted by this little guy poking out. Guess what it is?
The inside pad delaminated and cracked right half in two.
Inside layer of the steel was all rusted out, and I wonder how long it was separating for.
Luckily I had a complete rear brake kit waiting to go in, because the shop monkeys told me my rear brakes were in great shape during my vehicle safety inspection at the end of October, but I guess they didn't pull the wheels to look at the inside pads. The outside pads had a lot of life left, but the inside passenger was cracked, and the inside drivers was worn down to the steel - no friction material left. What did I pay for in that "safety" inspection.
I work from home and have probably put less than 500 miles on the car since Oct.
Anyways, it got dark during the 2nd brake rotor and pad swap, but it's muy bien now.