ABS hydraulic unit, removing and installing: Removing

CAUTION: On vehicles equipped with Audi Telematics by OnStar, switch-off the emergency (back-up) battery for the Telematic/Telephone Control Module prior to disconnecting the vehicle battery. See EXAMPLE: SWITCH OFF EMERGENCY (BACK-UP) BATTEY . Switch-on the emergency (back-up) battery after reconnecting the vehicle battery. See EXAMPLE: SWITCH ON EMERGENCY (BACK-UP) BATTERY .

Disconnect battery.
See BATTERY DISCONNECT PRECAUTIONS .
Disengage connector from control module (arrow -1-) and disconnect (arrow -2-). See Fig 1 .

Fig 1: Disconnecting Connector From Control Module (Bosch 5.3)
Courtesy of AUDI OF AMERICA, INC.
Connect bleeder bottle to bleeder screw on front left brake caliper and open bleeder screw.
Insert brake pedal depressor between brake pedal and driver's seat. Depress brake pedal at least 60 mm.
NOTE: This prevents the brake fluid reservoir from emptying.
Do not remove brake pedal depressor until all brake lines have been reconnected to the hydraulic control unit.
Close front left bleeder screw.
- Protect engine compartment from escaping brake fluid.
Disconnect brake line connections at hydraulic control unit.
Seal brake lines and threaded holes using plugs from repair kit, Part No. 1H0 698 311 A.
Remove hex-nuts at hydraulic control unit bracket.
Remove hydraulic control unit.

WARNING: Brake lines must not be bent.