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:

Assembly overview - heat shield
1 -  Underbody heat shield Removing and installing → Chapter 2 -  Retainer Qty. 6 3 -  Heat shield for centre exhaust system Removing and installing → Chapter. 4&n ...

Refrigerant R134a
Air conditioners in vehicles use the evaporation and condensation process. The system contains a liquid with a low boiling point, called the refrigerant. The refrigerant used is tetrafluoroethane R134a, which boils at -26.5°C with vapou ...

Overview of fitting locations - operating and display unit, air conditioning system with electric/manual controls
  Note A warning lamp in the instrument panel controls will indicate that the selected function is active. If the warning lamp does not light up after the AC button is pressed, a fault may be stored in the control ...

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