Skoda Octavia II 2004 Workshop Manual page 190

Octavia II 2004 ➤ , Octavia II 2010 ➤
Brake systems - Edition 11.2017
– Open cut-off valve -C- to evacuate brake servo.
– Switch off engine.
– Read and make a note of measured value shown.
A vacuum decrease of 400 mbar in 12 hours is permissible.
If the vacuum decrease is greater, then check for leaks in the
vicinity of ...
1 - Brake servo
or
2 - Non-return valve, vacuum hoses with connectors and vac‐
uum pump/intake manifold.
If there are large leaks, the vacuum decreases steeply within a
few seconds.
Vacuum check in vicinity of brake servo:
– After generation of vacuum, close cut-off valve -A- in order to
check brake servo vacuum system.
Vacuum check in vicinity of non-return valve, vacuum hoses with
connectors and vacuum pump/intake manifold:
– Once vacuum has been generated, close the shut-off valve
-C- in order to check the vacuum system of the brake servo
vacuum gauge - VAS 6721- up to the intake manifold or the
vacuum pump.
Open cut-off valve -B- to facilitate removal of hose connections
and adapter.
5.7.4 Vacuum generation with manual vac‐
uum pump - VAS 6213-
Instead of vacuum generation by means of engine or vacuum
pump, the vacuum can be generated with the manual vacuum
pump - VAS 6213- in certain cases.
– Connect manual vacuum pump - VAS 6213- to vacuum hose
from connection -B- on brake servo vacuum gauge - VAS
6721- .
– Open cut-off valve -B-.
– Generate vacuum with hand vacuum pump - VAS 6213- until
between 600 and 950 mbar is shown on brake servo vacuum
gauge - VAS 6721- .
– Subsequently, carry out the corresponding checks.
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