Hydraulic Unit With Control Module, Removing And Installing: Removing

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 Audi S6, 2015 Audi A6 Quattro, 2015 Audi A6, 2014 Audi S6, and 2014 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

The DTC memory must be read with the Vehicle Diagnostic Tester before removing.

-- Connect the Vehicle Diagnostic Tester to the vehicle data link connector with the ignition switched off.

NOTE:

Switch the ignition on.

DTC memory interrogated, errors shown corrected and DTC memory erased.

-- Start the program "Replace steering column" in Guided Functions.

WARNING: Brake lines must not be bent.

-- Turn off the ignition.

-- Insert the Brake Pedal Actuator VAG 1869/2 between the brake pedal and driver seat. Press the brake pedal 60 mm.

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

Courtesy of AUDI OF AMERICA, LLC

-- Raise the vehicle.

-- Connect the bleeder bottle hose to the bleeder screws on the left front and left rear brake calipers and then open the bleed screw.

NOTE: This reduces the pressure in the hydraulic unit.

-- Close the left front and left rear bleed screw.

-- Lower vehicle.

-- Do not remove the Brake Pedal Actuator VAG 1869/2.

-- Remove the coolant reservoir bolts.

-- Remove the coolant reservoir with the attached coolant hoses upward from the bracket.

NOTE: Do not open the coolant hoses.

-- Disconnect the connector from the coolant reservoir.

-- Tie to the side the coolant reservoir with attached hoses.

-- To protect against escaping brake fluid, place a lint-free rag in the area under the control module and hydraulic unit.

WARNING: When working with brake fluid, observe relevant safety precautions and notes. Refer to BRAKE FLUID .

-- Mark the brake lines.

-- Remove the brake lines from the mounts.

-- Remove all brake lines form the hydraulic unit -2-.

Fig 2: Identifying Hydraulic Unit And Control Module

Courtesy of AUDI OF AMERICA, LLC

WARNING: Do not bend the brake lines near the hydraulic unit.

-- Seal brake lines and threaded holes with plugs from repair kit.

-- Disconnect the connector -1- from the control module -3-.

Fig 3: Identifying Hydraulic Unit And Control Module

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Make sure that no brake fluid enters control module connector housing. This could lead to corrosion of the contacts and thereby cause the system to fail.

Clean a dirty connector housing thoroughly with compressed air.

-- Remove the hydraulic unit and control module from the bracket.

Audi RS-6/RS-7:

Remove the bolts -arrows- and the bracket -1-.

Fig 4: Identifying Bolts And Bracket

Courtesy of AUDI OF AMERICA, LLC

Continuation for all vehicles:

Replace the control module:

If the Vehicle Diagnostic Tester has determined that control module is faulty "Control Module Faulty".
if there is visible damage to the control module housing or to the connector

-- Remove the bracket from the hydraulic unit.

CAUTION: The pump motor may not be separated from the hydraulic unit.