Quote Originally Posted by geezer101 View Post
I would also consider replacing the rubber brake lines. They can come apart internally as well + years of service can weaken them to the point where they expand and drop pressure.
+1 to that. Old hoses can internally collapse, swell, or otherwise get blocked, which can effectively act as a sort of check valve, causing the caliper they feed to hold pressure after the pedal is released.

FWIW, user B-Line here sells braided-stainless jacketed brake line sets tailor-made for our trucks -- more info and pics:

http://www.mightyram50.net/vbulletin...our-Mighty-RAM!

http://www.mightyram50.net/vbulletin...ed-Brake-Lines