After i bought my 84 300D, the front brakes (bendix) started squealing a bit, so i changed the pads. Squealing kept getting worse, so I added shims behind the pads with brake quiet and changed the rotors. No help, just kept getting worse. Changed the pads again and put on fresh rebuilt calipers, still no help, and im losing my mind. What else could it be??

__________________
1984 300D Turbo