Renewing Abs Control Unit J104 - Audi A8 2003 Workshop Manual

Audi A8 2003 ➤
Brake system - Edition 03.2013
– Connect pipes as previously marked:
1 - Primary piston circuit
2 - To front left brake caliper
3 - To front right brake caliper
4 - Secondary piston circuit
5 - To rear left brake caliper
6 - To rear right brake caliper
– Fit connector on hydraulic pump.
– Clip ABS unit onto bracket.
Note
Do not tighten bolts completely. This will make it easier to attach
the individual brake lines to the hydraulic unit.
– After tightening brake lines, tighten hydraulic unit.
– Remove brake pedal actuator - V.A.G 1869/2- .
– Bleed brake system
– Code ABS control unit - J104- (with EDL) ⇒ Coding control
unit with VAS 505x via "Guided Fault Finding" function .
– When renewing the control unit, select the function "Replace"
for the relevant control unit in the "Guided Fault Finding".
To do so, use the vehicle diagnostic, testing and information sys‐
tem - VAS 505x- .
– Perform final control diagnosis after attaching brake lines to
hydraulic unit ⇒ "Guided Fault Finding" function of vehicle di‐
agnostic, testing and information system VAS 505x .
Note
Final control diagnosis can be used to establish whether line con‐
nections have been interchanged.
Tightening torques
Component
Brake lines to hydraulic unit M10 (brake line di‐
ameter 5 mm)
Brake lines to hydraulic unit M12 (brake line di‐
ameter 5 mm)
Brake lines to hydraulic unit M12 (brake line di‐
ameter 8 mm)
3.4

Renewing ABS control unit J104

Removing
Caution
The two components must be removed from the vehicle before
separating the control unit from the hydraulic unit.
28
Rep. gr.45 - Anti-lock brake system
⇒ page 110 .
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