when i bought the truck it only had back brakes and it was because the prop. valve under the master was froze. so i replaced it with a working one i had. bled the brakes and tryed it out , they we soft. ok no problem replaced the master, bled the master and all the lines again. tryed it out and had the same thaing happen, it was soft and went to the floor. took it for a drive and if i was going 30mph and stomped the brakes it would slow down but would not stop, it would slow down alote but then it would roll to a stop.
with the truck off the pedal felt fine and was were you would want it but when it would be running it would go down
so i pulled the vac hose off and ran it like that and the brakes worked great. put the vac hose back on and the pedal would go down and the truck would not stop like it should :dunno:
thanks
Jon