brake bleeding..WTF?

inertia, you nailed it! I looked into the mysterious "combo valve" http://auto.howstuffworks.com/auto-parts/brakes/brake-types/master-brake2.htm
and found this..."The metering valve compensates for this, making the drum brakes engage just before the disc brakes. The metering valve ---does not allow any pressure to the disc brakes---- until a threshold pressure has been reached. The threshold pressure is low compared to the maximum pressure in the braking system, so the drum brakes just barely engage before the disc brakes kick in."
So that explains why The pedal goes to the floor, it is compressing the rear lines that are empty, never being able to overcome the threshhold pressure to allow the fronts to kick in. 'Course that doesnt explain how the fronts are suppose to work at all if the rear lines blows, but I dont have to understand everything, only what I can control. Knowledge is power....!