Any and all help is welcome, as I have no clue where to start.
Here's the story: Driving home last night my car felt as if the parking brake had engaged (I checked, it was not). The drag worsened, but I only had a couple of blocks left, so I pushed it

. Got home to red hot rear rotors (both sides). After a few minutes of cussing myself, I heard an explosion. I later found a large chunk of the left rear caliper under the car. (see photo)
Here's what I know: I will have to replace the blown caliper. It is only smart to replace both rotors and pads. Maybe smart to replace the other caliper while I'm down there.
Here's what I don't know: What caused the problem. I suspect the parking brake because both sides were hot. I don't want to replace the whole rear brake system just to have this happen again.
Help!
Paul