The rear disc brakes appear to have overheated. The left rear rotor was showing signs of delamination along the outer edge. On both left and right sides, the outer pads were worn out whereas the inner pads had about 50% of the material remaining. On both sides of the vehicle, the inner and outer pads were difficult to remove from the caliper support bracket. The pads were flush against the rotor, and I had to use a hammer and a chisel to extract them, There is too much friction between the upper and lower tabs of the backing plates and the grooves in which they ride. I don't know if the electronic park brake feature was a factor in this issue.