First pull vac on the modulator. It won't hold vac but if you pull about 15"hg on it is should drop steadily down to zero in about 30 seconds. If you can't even get it up to 15 then the modulator is leaking and needs to be replaced.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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