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My trucks have always stopped fine unless there was an issue...And the issues were either known or easily realized. I would consider looking for an incorrect combo of brake parts..IE, wrong (mismatched) master cyl/brake booster for the rest of the brake code package, such as a JD3 master on JD5 or 7 booster, or vice versa, JD3 booster with JD5 or 7 master....Unless its hydroboost (JD8), in which case this is mostly a non issue, except a non hydroboost master on a JD8 booster.Did that make sense?On related note, I'm experimenting with my 76 k20, since I get a lot of parts dirt cheap through work (O'Reillys), I'm trying a hydroboost master cyl on my vacuum booster...the hydroboost is a larger bore, possibly longer stroke, and I expect I might have to try extending the pushrod from the booster if brake performance is not up to snuff when I finish putting the truck together, but with a rear disc conversion, theoretically more fluid movement, and carbon metallic pads, I'm crossing my fingers for even better braking. Once I put the system through the paces, I'll create a thread relating my findings, then any changes required, for future reference.