ok, so we replaced the master cylinder, we bench-bled it as directed, then bled the brakes. started it up, and instead of a full-floor mush pedal as before it was now like the engine was off, a hard pedal with little grab requiring a very hard push to stop the truck, and the engine revved slightly when pushing the brakes. obvious vacuum problem there and the hard pedal is indicative of power booster failure. soooooo, we replace that as well, and we still have a mushy pedal. although mushy, it does grab hard at some point and we can get the brakes to lock up, but it aint at all right.
any other ideas on why we have still have mush? when bleeding, starting with the right rear, how many pumps or how much volume should you bleed to feel sure that the entire length is flushed? we are using the little magnetic bottle bleed kit from auto zone.
david