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 door handle
Note
Removal and installation are described only for the right
door handle. The right side is similar.
Removing
General information and work instructions for the door handle
ke ...
Introduction
This chapter contains information on the following subjects:
→ An economic driving style
→ Driving in a fuel-efficient manner
Fuel consumption, environmental impact and wear on the engine, brakes and tyres
depend largely on three factors:
Personal driving style.
...
Dealing with problems with Midtronics -INC 940- battery tester
Under certain circumstances, the display may show errors or
messages according to status.
The most frequent display messages are listed below,
together with suggested solutions.
Note
For messages not liste ...
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Connecting vacuum gauge for brake servo -VAS 6721-
Checking for leaks