while driving the pedal goes almost to the floor. new master cylinder(bench bled), booster, bled the lines about 6 times starting with farthest from master and working closer. i was driving in wet weather and noticed that the front tires are grabbing but the rear are not. front skid a bit in wet weather. I have tried to bleed the RABS or proportioning valve. what ever its called. and still pedal goes almost to the floor before brakes work... i feel the truck slowing a bit when i first step on the pedal but still goes way down before catching... please help i have to drive this thing every day

 

One question comes to mind and that is , What about the rear brakes?
If the self adjusters aren't working all the work is being done by the front disc brakes.
It would be a good move to remove the rear wheels and check the amount of lining left on the shoes, the condition of the self adjusters and the wheel cyls etc., and the condition of the rear drums. Would you let us know what you find there?

 

That's not the only thing that comes to mind like what about the booster