5 Series E34 525td (M51) TOUR
VS-42 je
Baugruppe/Group: 11
11 02 05 (130)
weltweit
Datum/Date:
02/2005
Vacuum supply
All models
Introduction
Vacuum is principally used for the brake booster.
The vacuum in the inlet pipe depends on the varying engine load.
Diesel engines do not normally have any vacuum in the inlet pipe. Vacuum on diesel engines is provided by a pump
that generates the required vacuum.
On spark-ignition engines with Valvetronic, the throttle valve is almost always open when driving. This means that
there is a lower low air pressure in the intake manifold.
Spark-ignition engines with low vacuum in the inlet pipe also have a pump that generates additional vacuum.
[System overview ...]
Brief description of components
The following components are involved in the vacuum supply system:
-
Mechanical vacuum pump
A mechanic vacuum pump is fitted to diesel engines and spark-ignition engines with Valvetronic.
The vacuum pump is mechanically driven by the engine, e.g. via the exhaust camshaft.
-
Suction-jet pump
As a rule, the suction-jet pump boosts the vacuum in the inlet pipe.
[more ...]
SBT Vacuum supply All models
BMW AG - TIS
23.01.2013 11:39
Issue status (12/2007) Valid only until next DVD is issued
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