1994 Plymouth Voyager no vacuum at the pedal

Description is very confusing. As near as I can figure out, you have no power assist to the brakes. What do you mean by "no pressure". Do you mean the brakes don't apply?

Do you have antilock brakes? If so, you might have a pump that's not building enough pressure. Not sure which system is used on '94 models. My '93 Dynasty uses pressurized brake fluid to operate the ABS and to provide the power assist. Minivans used the same system that year. My '95 Caravan has a different system that uses a normal vacuum booster for power assist. It's very rare for vacuum boosters to fail except on GM vehicles. If you have a vacuum booster, check the large hose going to it to see if it is collapsing somewhere when the engine is running. You can also pop out the check valve from the booster, then feel for vacuum on the end. It should be quite strong. That vacuum should also be there long after turning the engine off.

Caradiodoc