engine AUDI A4 1999 B5 / 1.G Vacuum System Servicing Workshop Manual
Page 3 of 4
87-187
Vacuum supply and one-way valve,
testing
Notes: - Detach hose -B- from two-way valve (N63) and connect vacuum gauge
VAG1368 (or equivalent) to hose.
- Start engine and run at idle until the readout has stabilized.
- Switch off engine. Vacuum reading on gauge must not drop by more
than 50 mbar within 2 minutes.
Specification for vacuum when engine running: greater than 250 mbar.Removing and installing vacuum reservoir and one-way valve page 87
-188
Testing -N63-, output Diagnostic Test Mode (DTM) page 01
-42
.
Pa
ge 3 of 4 Vacuum s
ystem, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.87.27