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. |
|
|
|
Special tools and workshop equipment
required
Vacuum gauge for brake servo -VAS 6721-
...
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:
Removing and installing radiator, Golf, Golf SV, Golf Estate
Note
Radiator and water radiator for charge air cooling circuit
are removed together.
Removing
–
Drain coolant
→ Chapter.
–
Remove radiator cow ...
General
Perform a road test to determine whether a vehicle is
pulling to one side and if so, which side. If the vehicle pulls
to one side
→ Chapter.
When wheel alignment is checked, include the wheel alignment
test results in ty ...
Safety instructions for automatically dimmable interior mirror
WARNING
The mirror glass is made of several
layers and contains an electrolyte to achieve the
dimming functionality. Beware of liquid electrolyte
which runs out o ...
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