Page 1 of 18
45-41
 
  
Electronic Stability Program 
(ESP) hydraulic unit, servicing The tightening torque for all brake lines on the Audi 
A4 is 15 Nm (11 ft lb).  
1 - 
ESP hydraulic unit 
Always replace complete unit
2 - 
Nut 12 Nm (9 ft lb)
3 - 
Bolt and washer assembly 9 Nm (80 in lb)3x
4 - 
Resilient bushing 2x
5 - 
ESP hydraulic pump -V156- Assembly includes brake pressure sensor
6 - 
Resilient pad Pad stud mount to hydraulic pump: 2 Nm 
(18 in lb) 
7 - 
Vehicle body 
Pa
ge 1 of 18 Electronic Stabilit
y Pro
gram 
(ESP
) hydraulic unit, servicin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.5 
         
        
        
     
        
        Page 7 of 18
45-46
 
    
-  Remove mounting screws (arrows) and swing coolant expansion tank 
to side. 
   Tightening torque: 6 Nm (53 in lb)
    
Pay attention to bottom mounting (rubber grommet) when installing.  -  Remove bolts -1- for hydraulic fluid reservoir and swing to side.
   Tightening torque: 10 Nm (7 ft lb)
Pa
ge 7 of 18 Electronic Stabilit
y Pro
gram 
(ESP
) hydraulic unit, servicin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.5 
         
        
        
     
        
        Page 16 of 18
45-53
      
Removing steering column switch 
     
-  Unlock steering column adjustment.
     
-  Pull steering column out to stop.
    
- Remove screw -1- (2x). 
   Tightening torque: 3 Nm (27 in lb)
- Remove handle -2-.
    
Note:  
When installing, the upper trim panel has to be inserted into the hooks of 
the lower trim panel, swiveled down and then screwed tight.  -  Remove two Phillips head screws (arrows).
   Tightening torque: 0.6 Nm (5.4 in lb)
-  Remove upper trim panel -1- for steering column switches.
Pa
ge 16 of 18 Electronic Stabilit
y Pro
gram 
(ESP
) hydraulic unit, servicin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.5 
         
        
        
     
        
        Page 17 of 18
45-54
 
    
- Remove screws -2- (2x). 
   Tightening torque: 0.6 Nm (5.4 in lb)
-  Remove hex socket head screw -1-.
   Tightening torque: 0.6 Nm (5.4 in lb)
-  Remove lower steering column trim panel -3-.
    
-  Release steering angle sensor at catches (arrows).
Pa
ge 17 of 18 Electronic Stabilit
y Pro
gram 
(ESP
) hydraulic unit, servicin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.5