Vacuum Pump - BMW N55 Manual

Vacuum Pump

The vacuum pump is similar to that used on the N63 engine. It is a two-stage pump and
therefore has two connections. The first stage is for the brake booster and the second for
the auxiliary consumers.
N55, vacuum pump
Index
1
2
3
4
5
6
The largest area is used for the first stage, ensuring vacuum is built up at a rapid rate for
the brake booster. The last section is the opening stage for the auxiliary consumers. It
therefore takes longer to build up the vacuum here, as shown in the following diagram.
Explanation
Non-return valve for brake booster
Non-return valve for auxiliary consumer
Connection opening for auxiliary consumers
Vacuum pump housing
Vane
Connection opening for brake booster
69
N55 Engine