VW Golf manuals

Volkswagen Golf Service & Repair Manual: Checking vacuum generation

  Note
The average air pressure of the earth's atmosphere at sea level is 1013 mbar and decreases steeply as the altitude increases (approx. 100 mbar/1,000 m altitude). Local and time fluctuations also influence vacuum generation.
A cold engine, a switched-on air-conditioning system as well as engine idling have an adverse influence on generation of a vacuum.
–  Before starting work, check all vacuum hoses for damage (e.g. cracks or marten bite) and to check that they are correctly and firmly attached
–  Connect brake servo vacuum gauge -VAS 6721- → Chapter.
–  Open cut-off valve -A-.
   
–  Close cut-off valves -B+C-.
–  Start warm engine (>60°C), press accelerator briefly (engine speed above 2,000 rpm).
–  Read indicated measured value.
Normally (see notes), the vacuum that is generated should be between 600 and 950 mbar (depending on engine size).
If the measured value is not reached even through the preconditions (see notes) have been met, the vacuum system must first be checked for leaks.
–  For comparison purposes, generate the vacuum with the manual vacuum pump -VAS 6213- → Chapter.
Open cut-off valve -B- to facilitate removal of hose connections and adapter.
 

Checking vacuum generation

Connecting vacuum gauge for brake servo -VAS 6721-
Special tools and workshop equipment required     Vacuum gauge for brake servo -VAS 6721- ...

Checking for leaks
  Note The average air pressure of the earth's atmosphere at sea level is 1013 mbar and decreases steeply as the altitude increases (approx. 100 mb ...

Other materials:

Pressing tyre off wheel rim
New wheels with a modified contour have been introduced for all vehicles as of model year 2005. The tyre fitting unit must be furnished with the tyre fitting head designed for these wheels.   WA ...

Removing and installing dash panel
Special tools and workshop equipment required       Torque wrench -V.A.G 1783- Removing –  Remove centre console → Chapter. ...

Removing and installing fresh air blower control unit -J126-, RHD vehicles
Removing –  Remove baffle plate → Chapter.     –  Disconnect electrical connectors -1- and -4-. –  Remove bolts ...

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