Sokay... 1990 GMC F/S Jimmy 350/700/241/10bx2 So on monday the driver's side brake heats up, I assume that it's the flex line. It does it again on tuesday, and luckly my day off this week was to be today. So it decides to rain on me. Anyways. I replace the flex line, bleeder screw, and hard line to the "t" in my truck (doesn't have a proportioning valve in the x-member like all my other rigs). Have my father start helping me bleed and one of the lines going to that t is now leaking. Guess it wasn't boiling liquid that made my pedal go to the floor.... So I replace that line, I happen to have a new flex line so I change that for fun too. Now I have two nice new lines to both front wheels and everything is peechy, right? No... no pedal. Now the rear resevoir, for the front brakes, went empty when I lost my pedal. I have filled this up, and am getting no bubbles through the calipers. But the brake fluid is foamy in the resevoir. What gives? My GM shop manual doesn't mention this symptom, and I can only imagine that maybe the on-truck master cylender bleeding process could help? Should I bother bleading the rear cylenders?