Is this repairable or is this buy a new AW11?s

Hello, I was trying to change my rear brake pads on the 87 before I adjusted the parking brake cable. Bought the cube tool to spin the piston clockwise. I must have spun it at least 10 rotations with no sign of retraction. The old pads were not blown but they were about half through the brake...

Hi, This might sound like a complete noob question, but bear with me. First, I tried removing the rear speakers cover alone to fit some 3 1/2" aftermarket speakers on my 89 T-top, but although it's clearly a different piece than the panel, I can't remove it (scared to crack the plastic!)...