Protected By Copyright. Copying For Private Or Commercial Purposes, In Part Or In Whole, Is Not - Audi A8 2003 Workshop Manual

fold.
❑ Vehicles with a V6 petrol
engine and automatic gearbox are equipped with a brake vacuum pump.
❑ Checking function
❑ With the engine switched off, firmly depress the brake pedal several times (this reduces the vacuum
present in the servo unit).
❑ Then hold brake pedal in applied position employing moderate force and start engine. If the servo unit
is working properly, the pedal will give slightly under foot (servo assistance becomes activated).
❑ Renew complete unit if defective
❑ With bonded gasket
❑ Removing and installing
10 - Seal
❑ Renew
11 - Brake line
❑ Tightening torque: 24 Nm
❑ Brake master cylinder/primary piston circuit to hydraulic unit
12 - Trunnion bolt
❑ Tightening torque: 10 Nm
13 - Brake line
❑ Tightening torque: 24 Nm
❑ Brake master cylinder/secondary piston circuit to hydraulic unit
14 - Mounting bracket for pedal cluster
❑ Removing and installing
15 - Hexagon nut

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ Tightening torque: 25 Nm
with respect to the correctness of information in this document. Copyright by AUDI AG.
16 - Torx socket head bolt -T45-
❑ Tightening torque: 25 Nm
Adjusting ball head
LHD vehicles:
a = 184.4 mm ± 0.5 mm
Note
Surface -1- for measuring
♦
When measuring the ball head, it must be set at right angles
♦
to the surface of the brake servo.
Measure to end of ball head without gasket fitted.
♦
Tightening torque:
Ball head to brake servo
Caution
Before driving vehicle for the first time, make sure function of
brakes is OK.
⇒ page 117
⇒ page 77
Brake system - Edition 03.2013
30 Nm
8. Brake servo/ brake master cylinder - exploded view
Audi A8 2003 ➤
113