Ok so I dissconnected it today to see "what if.." well the pump stopped for a moment then started up in overdrive. Has anyone worked on a 1994 c280 and become familar with the vacuum system?? Thanks.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon