This was posted on YouTube yesterday. It shows a soaked set of brake pads next to one rotor that looks normal and the other has a bronze color. The pads on the normal looking rotor look to be in decent shape. The other side with the discolored rotor has uneven wear. From the makings on the pads, it looks like the outer pad took most of the abuse while the inner pad has some tapered wear.
So what happened?
My best guess is that the caliper slides or guide pins or the pad seized in the bracket. This prevented the caliper from applying equal force on the pads. Eventually, the piston seal began to leak brake fluid.
Your guess? Leave it in the comments below.