[old cool]

Oh yea 55, forgot to mention, the previous owner of my truck plugged the check valve which made it a non power brake system. He said he liked the feel better than pb. I found it almost impossible to stop safely and absolutely knew I would crash into someone if I didn't keep a very long distance between me and other drivers. My truck stopped exactly like you are describing and I therefore replaced check valve. That being said, I think its fair to assume your booster is not working or as others have suggested, your rod/modifications are not right.