Abs Hydraulic Unit -N55- With Abs Control Module -J104-: Removing

WARNING: This page is about a different variant/trim than selected.

-- Read the control module version and make a note of it.

NOTE:

Use the vehicle diagnostic tester VAS 5051B or VAS 5052 for this.

-- Disconnect the battery, refer to BATTERY, DISCONNECTING AND CONNECTING , noting the radio code.

-- Insert the V.A.G 1869/2 between the brake pedal and driver seat by pressing the brake pedal down at least 60 mm. By doing this, the valves in the brake master cylinder are closed and the brake fluid reservoir does not run empty.

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

Courtesy of AUDI OF AMERICA, LLC

-- Connect the hose from a bleeder bottle to the bleeder screw on the left front caliper.

-- Open the bleeder screws on the left front and rear brake calipers to reduce the pressure in the ABS hydraulic unit.

-- Close the left front and left rear bleeder screws.

NOTE:

Do not remove V.A.G 1869/2.

-- Press the securing clip on the connector to the control module -1- up.

Fig 2: Identifying Brake Lines

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-- Pull the securing bracket in the -direction of the arrow- and remove the connector.

Fig 3: Pushing Retaining Plate And Disconnecting Connector

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.

A contaminated connector housing must be carefully cleaned with compressed air.

-- To protect against escaping brake fluid, place a lint-free cloth in the area under the control module J104 and hydraulic unit.

-- Mark the brake lines for installation later.

WARNING:

Do not bend or kink the brake lines.

-- Remove the brake lines from the ABS hydraulic unit and brake master cylinder.

-- Remove the remaining brake lines -arrows- from the ABS hydraulic unit.

Fig 4: Identifying Brake Lines

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

-- Carefully remove the ABS hydraulic unit together with the ABS control module -- upward from the bracket.

NOTE:

When removing the ESP control unit from the bracket, make sure the rubber buffers do not fall into the engine compartment.

WARNING:

Excessive shaking (for example dropping, impact) may destroy the control module. Control module must then no longer be used.

-- Set the ABS hydraulic unit -- with ABS control module -- down on a clean, level surface.

NOTE:

Seal the threaded holes and brake lines with plugs after removing the ABS control module -- and ABS hydraulic unit --.

WARNING:

The hydraulic pump must not be separated from the hydraulic unit N55.