[scottk]

Manual brakes which came factory with metallic pads or shoes also would normally come with a smaller bore master cylinder than their non heavy duty counterparts, to generate the extra line pressure needed... which means a lower pedal. Or they would simply come ONLY with power brakes. Most semi mets will require higher line pressure. The friction properties are not the same, and so are not well suited to a manual brake application, though they do reduce fade.

[71firebird400]

"I'll take a major gamble and feel confidant that I can say "I told you so" as you work your way to the brake rod/master cylnder"

My first post mentions that I've already replaced the master cylinder with a new, correct, one. Oh, and I'M POSITIVE THAT THE ROD IS IN THE RIGHT HOLE. Sorry about being unclear before. Yesterday I checked to make sure the proportioning valve was operating (the rod was coming out when you hit the brakes, and went back in when you let off). I also watched the brake lines as my friend hit the brakes; no evident bulging or expanding.

ScottK- what pads would you recommend?

Once again, thanks for all the help!