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I didn't intend to suggest a hose issue would fix the booster problem, but that disconnecting the booster vacuum would disable (or weaken) its response to the MC. If the brakes no longer stick with booster vac. disconnected (plug the manifold side, though) then it would seem likely to be the booster instead of the MC. I thought that is what you wanted to test.
On my 1800S car, though, the brakes work just fine un-boosted; the booster was really a afterthought for that system. The Alfa, on the other hand, I _think_ brakes poorly without the booster. I drove a Suburban whose booster had just sprung a leak and it took real effort to get it to stop. That booster was replaced immediately.
Michael
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