[[/quote] There isn't any proportional valve on it(see pic). [/quote]

Jim...look closely at the pic...on the right side of the engine, look at the master cylinder, then look right of it, and down a bit...the proportioning valve assembly is there. Whether or not all the lines are hooked up correctly, or its adjusted properly remains to be seen. But its there... So that begs the question... drums, or disc, correctly hooked up lines, enough fluid, contaminated fluid, air in the lines, faulty wheel cylinders, etc...