ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING: Removing

Fig 1: Brake Pedal Depressor VAG 1869/2 Inserted Between Brake Pedal And Driver's Seat

Courtesy of AUDI OF AMERICA, LLC

-- Insert the Brake Pedal Actuator: VAG1869/2 between the brake pedal and driver seat. Press the brake pedal down at least 60 mm.

NOTE:

By doing this, the valves in the brake master cylinder are closed and the brake fluid reservoir does not run empty.

WARNING:

Risk of skin irritation.

To prevent skin contact with brake fluid, wear chemical resistant safety gloves.

-- Remove the protective cap -3- from the bleed screw -1- on the left front caliper.

Fig 2: Identifying Protective Cap, Bleed Screw And Container Bleeder Hose

Courtesy of AUDI OF AMERICA, LLC

-- Connect the bleeder bottle hose -2- as shown.

-- Open the bleed screw to reduce the pressure in the brake system.

-- Close the bleed screw and remove the bleeder bottle.

-- Repeat the procedure on the left rear brake caliper.

NOTE:

Do not remove the : VAG1869/2 .

-- Remove the Engine Control Module -J623- from the bracket and set aside. Refer to the appropriate Service Information .

Courtesy of AUDI OF AMERICA, LLC

-- Remove the nuts -arrows- and push the bracket -1- for the engine control module slightly rearward.

Vehicles with 3.0L TDI Engine and High-Voltage System:

Courtesy of AUDI OF AMERICA, LLC

-- Disconnect the connector -3-.

-- Remove the nut -2- and remove the NOx Sensor Control Module -J583- from the bracket.

Continuation for All Vehicles:

Courtesy of AUDI OF AMERICA, LLC

-- To protect against escaping brake fluid, place enough lint-free cloths in the area below the hydraulic control unit.

-- Mark the brake lines for reinstallation.

-- Remove the brake lines -1 and 2- from the ABS Hydraulic Unit -N55- and free up if required.

CAUTION:

Risk of damaging the brake lines.

-- Immediately seal brake lines and threaded holes with clean plug from the Assembly Part Set: 5Q0 698 311 .

-- Release the connector -3- and disconnect from the control module.

NOTE:

Make sure that no brake fluid enters the control module connector housing.

-- Free up the wire.

Courtesy of AUDI OF AMERICA, LLC

CAUTION:

Risk of damaging the brake lines.

-- Remove the hydraulic control unit -2- carefully from the pins -arrows- on the bracket -1-.

Remove the bolt -arrow- and the bracket -1-.

Courtesy of AUDI OF AMERICA, LLC

NOTE:

The ABS Control Module -J104- can be replaced separately if faulty. Refer to CONTROL MODULE, SEPARATING FROM HYDRAULIC UNIT .

The ABS Hydraulic Unit -N55- must be replaced together with the ABS Control Module -J104- if faulty.