Intake VOLKSWAGEN PASSAT 1996 B3, B4 / 3.G Service Workshop Manual

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6 - Brake servo On gas engines the
vacuum required is
taken from the intake
manifold. On Diesel engines an
exhauster is installed
to create the required
vacuum. Functional check - With engine
switched off,
depress brake pedal
firmly several times
(to exhaust the
vacuum in the unit).
- Now depress brake
pedal with average
foot pressure, hold
and start engine. If
the servo unit is working properly, the pedal will be felt to
give slightly under
foot (servo
assistance becomes
effective). If faulty replace
complete. Check valve (item 14 )
is in vacuum hose Functional check - It must be possible
to blow through in
direction of arrow.
- Blowing against the arrow the valve must seat. Page 2 of 4Assembly overview: brake master cylinder/brake servo12/7/2004http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.SU01.47.1