thanks guys. ALL the brake system ,except the peddle,is new except the master cyl which is rebuilt.Brakes are kinda important(which is why I posted my brake failure)so I took the truck to a old,experienced brake shop(owner has a 40's panel truck).He confirmed my view that it IS the single master that failed. Will post the problem as soon as I can do it accurately. I'm kinda new to this stuff.
