OK, I'm about to burn this damn thing to the ground! So I started today with buying a mightyvac and bleeding the 2nd new MC, still no go. I re-installed the original MC for S&G and still no go. When to the parts store and got a 3rd new MC that is installed right now, still can't get any pedal after I start the truck and the brake warning light will not go out. As the bleeding the MC, The brass drift I have been using to bench bleed it, I marked a line at 1 inch as to not push the piston in foo far. Again, no external leaks, all new hydraulics, new pads, new shoes, disks and drums. I am thinking about removing the combo valve and trying to clean it, but I really don't see how that will help.