Vacuum Pump (Diesel)
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, 2004 Ford Cutaway, and 2003 Ford RV Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Vacuum is supplied from a belt-driven vacuum pump. Diesel equipped vehicles use a low vacuum indicator switch. Indicator switch is located on left side of engine compartment, near vacuum pump. Indicator switch will turn on brake warning lamp when a low vacuum situation occurs.