Vacuum System: Notes
The N55 engine is equipped with a vacuum pump for generating the vacuum required by the brake booster and the auxiliary consumers (exhaust flaps and wastegate). A vacuum accumulator (built into the cylinder head cover) is used to ensure there is sufficient vacuum for the wastegate valve at all times.
INDEX EXPLANATION CHART
| Index | Explanation |
|---|---|
| 1 | Vacuum pump |
| 2 | Non-return valve |
| 3 | Non-return valve |
| 4 | Brake servo unit |
| 5 | Non-return valve |
| 6 | Vacuum accumulator (Integrated into the cylinder head cover) |
| 7 | Electropneumatic pressure converter (Vacuum solenoid) |
| 8 | Vacuum unit, wastegate valve |