light AUDI A4 2000 B5 / 1.G Master Cylinder 25mm Workshop Manual

47-42


3 -
Flange nut
Always replace50 Nm (37 ft lb)
4 -
Sealing plug Moisten with brake fluid and insert into
brake master cylinder Press brake fluid reservoir into sealing
plugs
5 -
Brake fluid reservoir with brake fluid level
warning switch
Functional check:
- Remove brake fluid reservoir cap and
with the ignition switched on push on
strainer in reservoir.
- The warning light in the instrument panel
insert comes on and an audible warning
signal sounds. Removing and installing page 47
-46
Fluid couplings are on the side of the
reservoir Pay attention to information found on the
label on the reservoir before adding fluid
6 -
Seal
Pa
ge 2 of 11 Brake master c
ylinder with 25.4 mm
(0.999 in.
) diameter
piston and brake servo, com
ponent summar
y
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.47.7

47-43


7 -
Brake fluid reservoir cap
8 -
Fluid supply hose
From brake fluid reservoir to clutch master
cylinder
9 -
Seal Install in groove in brake master cylinderReplace after removing brake master
cylinder
10 -
Brake servo Removing and installing page 47
-46
Adjusting ball head Fig. 1
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 unit is working properly, pedal will
be felt to give slightly under foot (servo
assistance becomes effective).
If malfunctioning:
- Replace as complete unit only.
Pa
ge 3 of 11 Brake master c
ylinder with 25.4 mm
(0.999 in.
) diameter
piston and brake servo, com
ponent summar
y
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.47.7

47-47


Releasing brake pedal
- Remove brake light switch.
1 -
Inserting T10006 brake pedal release tool
Insert the tool from below
2 -
Release procedures
- Tightly hold brake pedal.
- Lift catches off ball head using a slight
pull on tool (arrow -A-).
- Tension tool so catches do not re-
engage ball head.
- Pull brake pedal from ball head (arrow -
B-).
Pa
ge 7 of 11 Brake master c
ylinder with 25.4 mm
(0.999 in.
) diameter
piston and brake servo, com
ponent summar
y
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.47.7

47-50

Installing
Note the following points:

- Adjust brake light switch page 46
-50
.

- Adjust vent valve for cruise control system
page 46
-54
.
Bleeding clutch hydraulics

- Connect US1116 brake bleeder but do not
switch on yet.

- Open bleeder screw on clutch slave cylinder.

- Attach collector bottle hose.

- Switch on bleeder unit and allow approx. 100 cc
(6 oz.) of brake fluid to flow out of clutch slave
cylinder.

- Close bleeder screw.

- Bleed brake system page 47
-23
.
Pa
ge 11 of 11 Brake master c
ylinder with 25.4 mm
(0.999 in.
) diameter
piston and brake servo, com
ponent summar
y
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.47.7