Page 3 of 11
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
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11/20/2002 htt
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play?action=Goto&t
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pair&id=AUDI.B5.SU03.47.7 
     
        
        Page 8 of 11
47-48
      
-  Attach bleeder hose and bleeder bottle to left-
front brake caliper bleeder screw and open 
bleeder screw. 
     
-  Operate brake pedal to pump out as much brake 
fluid as possible. 
     
-  Close left-front bleeder screw.
    
-  Remove bolt -3- attaching brake fluid reservoir -4-.
-  Disconnect harness connector -2- to brake fluid level warning switch.
    
Note:  -  On vehicles with manual transmissions, disconnect clutch master 
cylinder supply hose -1- and seal with plug. 
Cover plenum to catch any spilled brake fluid.The brake fluid reservoir is attached to the master cylinder on the 
bottom side. 
Pa
ge 8 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 
     
        
        Page 11 of 11
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