Skoda Octavia II 2004 Workshop Manual page 189

– Open locking valve -A-.
– Close cut-off valves -B+C-.
– Start warm engine (> 60°C), press accelerator briefly (engine
speed greater than 2000/min).
– Read indicated measured value.
Normally (see notes), the vacuum that is generated should be
between 700 and 950 mbar (depending on engine size).
If the measured value is not reached even through the precondi‐
tions (see notes) have been met, the vacuum system must first
be checked for tightness.
– For comparison purposes, generate the vacuum with the man‐
ual vacuum pump - VAS 6213-
Open cut-off valve -B- to facilitate removal of hose connections
and adapter.
5.7.3 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 in‐
creases (approx. 100 mbar/1,000 m altitude). Local and time
variations also influence the 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
– Place vacuum gauge for brake servo - VAS 6721- in between
⇒ page 181 .
– Open locking valve -A-.
– Close cut-off valves -B+C-.
– Start warm engine (> 60°C), press accelerator briefly (engine
speed greater than 2000/min).
Normally (see notes), the vacuum that is generated should be
between 700 and 950 mbar (depending on engine size).
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⇒ page 184
with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S.�
Octavia II 2004 ➤ , Octavia II 2010 ➤
Brake systems - Edition 11.2017
.
183