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I'm with Andrew here. The rev-test isn't the only way to determine if a servo is failing or has failed. It shows if there's a loss in vacuum, which the servo would introduce if the rubber is punctured somewhere. But as far as I understand how these work, if the booster valve is stuck closed you'd have no brake assist *and* no loss in vacuum. Just a theory, but that's where I'd look.
Aaron
ps: beautiful car!
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1967 Giulia Super (blk plate), 1969 BMW 1600 (blk plate), 1966 Giulia TI, 1962 Corvair Rampside, 1969 Triumph T100C, 1965 Honda CB77, 1957 Vespa Allstate
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