To directly check to see if its the vac pump or the break booster try this:
Hook up your mitvac to the main line that goes from the pump to the booster. Then plug any other lines. Start the car and see if it holds steady or not. It should be reading 20"-25" If yes then both the pump and booster are fine. If no then use a wrenchc to remove the main line from the booster. Then plug the end of the main line. I usually lick my thumb and put it on the hole tightly. If the vac is 20-25 then the pump if fine, and the booster is your leak. If the vac is jumpy or much below 20 than the pump needs rebuild or possibly a replacement.
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Andrew '04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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