Originally Posted by gearheadslife
crack the line for the rears, and see if the pedal now is easier.. I'm guessing here that the rear brakes are in the master port nearest the booster, if the rubber line is failing internally, it block flow under pressure and make it hard to move the piston in the master.. as will a stuck propotioning valve that closed off the rears..
How old are those rubber lines in the rears?
They do close up internally over time, restricting the flow.
I had a similar problem with my land rover . Put a new flexible rubber hose it , and bingo! Problem solved.......
just a thought, hope you sort it soon,