Originally Posted by mitmaks
He lives on a gravel road. Pushing pedal as hard as I could it didn't lock up brakes.
I pumped up brakes and then started the truck and pedal didn't move at all, which makes me believe booster is bad.
It sounds like the booster is bad to me also. As already mentioned, a new booster W/O master cylinder should be less than $100.oo . First though, I would make sure that the vacuum check valve on the booster is opening. Just pull it out of the booster leaving the hose attached and make sure you are pulling vacuum. Let us know.