Who has Dr. Diff 8 3/4 rear discs? Pt. 2

The e-brake cable routing is indeed wrong. Maybe it is / was under tension that way. Sometimes if you pull the lever on the e-brake first, and then push the regular brake pedal. It is messed up. Then you must try to push the piston back, and pump the piston/brakepad to the disc with the pedal. After that you can try the e-brake.