radio AUDI A4 1998 B5 / 1.G ABS Bosch 5.3 Workshop Manual
Page 5 of 6
45-22
      
Removing  
     
CAUTION! 
     
Do not bend the brake lines.
     Before disconnecting the battery, determine 
the correct coding for the anti-theft radio. 
     
-  Disconnect battery Ground (GND) strap.
    
Note:  
The brake pedal depressor must remain in position until all of the brake 
lines have been reconnected to the hydraulic control unit.  -  Release control unit connector (arrow -1-) and disconnect harness 
connector (arrow -2-). 
-  Connect bleeder bottle to bleeder screw on left-front brake caliper and 
open bleeder screw. 
-  Install brake pedal depressor between brake pedal and driver's seat. 
Depress brake pedal by at least 60 mm (2 3/8 in.). 
-  Close left-front bleeder screw.
-  Cover engine compartment to make sure brake fluid does not flow into 
it. 
-  Disconnect brake line connections on hydraulic control unit.
Pa
ge 5 of 6 Anti-lock Brake S
ystem 
(ABS
), Bosch 5.3
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.3 
Page 6 of 6
45-23
      
-  Seal brake lines and threaded holes using plugs 
from repair kit, Part No. 1H0 698 311 A. 
     
-  Remove nuts from ABS hydraulic control unit 
bracket. 
     
-  Remove ABS hydraulic control unit.
     
Installing  
     
Note:  
     When installing, pay particular attention to the 
following points. 
     
Only remove the sealing plugs on the new 
hydraulic control unit when the corresponding 
brake line is about to be installed. 
     If the sealing plugs are removed too early the 
brake fluid can escape. If this occurs, the unit 
will no longer be sufficiently filled or adequately 
bled. 
     
-  Bleed brake system   page 47
-23
 .
     
- Enter radio code.
Pa
ge 6 of 6 Anti-lock Brake S
ystem 
(ABS
), Bosch 5.3
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.3