[Anonymous D]

Fluid in the brake booster, means the front seal on the master cylinder has worn away. The resulting buildup in the booster makes its way into the intake manifold via the long brake booster vacuum hose.
You need to drain the fluid from the booster and the hose (and the hoses' inline one-way check valve too), and replace that seal on the master cylinder. Booster evalustion depends on whether the rubber diaphragm is intact and air-tight, and if it has not been eaten through by brake fluid over time (test is usually performed on the car, with a vacuum pump/gauge).

Master Cylinder rebuild instructions, including procedures that would have prevented some of the complications noted earlier in this thread, were printed in the OMC Blitz in the June 2004 issue.
Cost for a reprint: All of a budget-busting $$two$$ dollars (including US postage).

This set of instructions, are not the same as those commonly included with the rebuild kits (you won't get this information from a generic dealer like RockAuto, either!), but are instead more comprehensive, as they were written from experiences during an actual disassembly and rebuild job.