[kwmech]

I had the same thing happen to me when I had my 78 Wrecker. Turns out I had to rebuild part of the linkage, mostly where the pedal swings under the dash, Pulled out the long bolt and changed the bushings and lubed it all up in both the clutch pedal and the brake pedal. Welded up the oblonged hole in in the steel plate (and redrilled), that connects to the rod that goes through the firewall. Generally went through all the linkage and tightened it all up. Worked like brand new when I was done