Abs Control Module -J104-/Abs Hydraulic Unit -N55-, Removing And Installing: Removing

WARNING: This page is about a different car, the 2024 Audi Q4 e-tron and 2023 Audi Q4 e-tron. However, it is still accessible from the selected car via links, so may be relevant.

ABS Control Module -J104- -1- will be called control module in the information that follows.

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ABS Hydraulic Unit -N55- -2- will be called hydraulic unit in the information that follows.

If the ABS Control Module -J104- is being replaced, then the test plan for replacing the control module must be performed.

-- Perform the "Control module, replacing" function with the Vehicle Diagnostic Tester. Refer to Diagnostic Entries .

Continuation

-- Disconnect the battery. Refer to BATTERY, DISCONNECTING AND CONNECTING .

-- Remove the air intake manifold for the heating and A/C unit. Refer to the appropriate Service Information .

-- Push the locking mechanism downward in -direction of arrow A-.

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-- Release the connector -1- in -direction of the arrow B-.

-- Disconnect the connector -1-.

-- Insert the Brake Pedal Actuator:V.A.G 1869/2 .

Fig 1: Identifying Brake Pedal Actuator

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-- Attach the bleeder bottle bleed hose to the left front brake caliper breather valve -1-.

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-- Open the breather valve.

-- Attach the second bleeder bottle bleed hose to the left rear brake cylinder bleeder valve -1-.

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-- Open the breather valve.

-- Push the brake pedal at least 60 mm using the Brake Pedal Actuator:V.A.G 1869/2 .

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

-- Do not remove the Brake Pedal Actuator:V.A.G 1869/2 .

CAUTION:

There is a risk of damaging the brake lines by bending.

- Never forcefully bend the brake lines in the hydraulic unit area.

-- Unclip the brake lines from the bulkhead.

CAUTION:

There is risk of damage caused by corrosion.

- Make sure no brake fluid gets on the contacts.

- Place sufficient lint-free cleaning cloths in the area of the connectors.

-- First mark both brake lines -5- and -6- and remove them from the hydraulic unit.

Fig 2: Brake Line Tightening Sequence

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-- Close the threaded holes with the plugs.

-- Mark the brake lines (brake calipers/brake cylinders) -1- through -4-, remove and then close the threaded holes.

-- Seal the brake lines with the Engine Bung Set:VAS 6122 .

Tip

Alternatively, place the breather valve dust caps on the brake lines.

-- Pull the hydraulic unit and the control module -1- together with the bracket -3- and the rubber bushing -4- in -direction of the arrow- upward.

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