"soft" brakes after rebuild

[Jelmer]

I've rebuild the front and rear brakes of our 93 D250 and the pedal felt good/hard like it should be. Now after a couple of month's the pedal started to feel soft all of a sudden. I've checked for leaks but I can't find anything.

What I've done so far:

* Reseal calipers
* New pads
* discs/rotors milled/resurfaced(don't know how you call that in english)
* New 3" shoes
* New Chevy wheel cilinders (the bigger ones)
* New hardware all around

The brakes felt good and it braked like it did a couple of years ago (These trucks brake like sthi I ghuess...)

Master cilinder? It looks like it is the one it came with from the factory! Are there any improved ones?

[ellis93]

I'd check the adjustment of the rear brakes first.

[PToombs]

^ what Ellis said, check the adjustment, then the next thing I would do is delete the ABS valve if it is still on there. If it's gone then I'd do the master cylinder. It could be the master, as old as the truck is, but that darn ABS valve is a more common problem.

[ihredneck]

^ Dido, I did have my master give out and was soft on me. It didn't show signs of leaking either, it was internal. If you do the master, be sure to bench bleed as well.