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N55 Engine
Vacuum System
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.
N55, vacuum system
Index Explanation Index Explanation
1
Vacuum pump
5
Non-return valve
2
Non-return valve
6
Vacuum accumulator
(Integrated into the cylinder head cover)
3
Non-return valve
7
Electropneumatic pressure converter
(Vacuum solenoid)
4
Brake servo unit
8
Vacuum unit, wastegate valve
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