[QUOTE=Codifex Maximus;2741737]Ok, I'm confused. You say the pedal goes to the floor yet the back wheel is still getting hot.

This tells me that the back pads are tight against the rotor and it's heating up due to friction. Furthermore, this tells me that the pistons in the calipers are not releasing. Leading me to believe that the caliper rebuild was not successful. Maybe there is a ridge that was not honed and it's catching the piston. This would cause the rear brakes to catch would it not?

All this barring bad wheel bearings or joints on axle assemblies.[/QUOwith

with the original MC the rear brake was hot, the calipers are ok, they are going back to normal when i'm releasing the pressure from the line (it was a lot of pressure on the line without pushing the pedal).
At that point i suspect that is something wrong with the MC, so i grabed another one from a junkyard and with the second MC my pedal is going to the floor.
next i will try to replace the rubber between the reservoir and the MC and the rubber caps.
I don't know if it makes sense but i will give it a try.