Volkswagen Golf Diesel 2009 Mode D'emploi page 283

Air Intake System
Vacuum Supply
The required vacuum for the brake booster and
other vacuum driven components of the engine is
produced by a mechanically driven vacuum pump.
The pump is a swivel vane pump driven by the
exhaust camshaft and is installed behind the high-
pressure fuel pump.
The vacuum pump is capable of providing a suffi cient
vacuum for all vacuum components under any
operating condition.
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For this reason, it is not necessary to use an
additional vacuum reservoir. The pump is rated to
deliver a continuous absolute pressure of 0.73 psi
(50 mbar).
Oil for lubricating the pump and to enhance the
sealing of the pump vanes is provided through a
special port in the cylinder head.
To Brake Servo
Check
Valve with
Integrated
Vacuum Pump on the
T-Piece
Exhaust Camshaft —
Mechanically Driven
Intake Manifold Runner
Control (IMRC) Valve N316
Vacuum Motor