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Vacuum pump

The vacuum pump is similar to that of the N63 engine. It is designed as 2-stage and accordingly has 2 connections:

Fig 1: Vacuum Pump Operation Diagram
G09841698Courtesy of BMW OF NORTH AMERICA, INC.
Item Explanation
1 Non-return valve for brake servo
2 Non-return valve for additional load
3 Opening for additional load
4 Housing
5 Vane
6 Opening for brake servo