check engine light AUDI A4 2000 B5 / 1.G Master Cylinder 23mm Workshop Manual

47-31


7 -
Brake servo
On gasoline engines vacuum is supplied
from the intake manifold On Diesel engines vacuum is supplied from
the vacuum pump
Functional check:
- With engine switched off, depress brake
pedal firmly several times (to deplete
vacuum in brake servo).
- Depress and hold brake pedal with
average foot pressure and start engine. If
servo is working properly, pedal will be
felt to give slightly under foot (servo
assistance becomes effective).
If malfunctioning:
- Replace as complete unit only.Check valve in vacuum hose - 9 -Removing and installing page 47
-37
Adjusting ball head Fig. 1
Pa
ge 3 of 15 Brake master c
ylinder with 23.81 mm
(0.937 in.
) piston diameter and brake servo, com
ponent summar
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