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The disk is either a Vacuum Check Valve (VCV - one-way) or a metering disk (Vacuum Delay Valve), but I think VDVs are colored. It doesn't really matter where you pull it apart, as long as you remember how to put it back. Messing with the vacuum system is asking for trouble, so put it back stock when you finish. Vacuum maps
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.