I am not sure I can use your style of diagnostics.

The brakes are the largest consumer of vacuum. Logically if the brakes work then the vacuum source must be OK!

Take this pill: http://www.continentalimports.com/ser_ic20242.html
and get back to me.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician