Control Module And Hydraulic Unit, Removing

Special tools and workshop equipment required

Fig 1: Identifying Sealing Plug Repair Set, Part No. 1H0 698 311 A

Courtesy of VOLKSWAGEN UNITED STATES, INC.

After separating the control module from the hydraulic unit, always install transport protection on the hydraulic unit for the valve domes.

Warranties will not be granted for hydraulic units without transport protection.

1 - Transport protection for valve domes (foam)

2 - Sealing plug M 10

3 - Sealing plug M 12

Removing

Component location:

The control module is bolted to the hydraulic unit and is located at right in the engine compartment.

WARNING:

Do not bend the brake lines near the hydraulic unit.

-- Read and note the present control module coding.

-- Note or request radio code on vehicles with coded radio if necessary.

-- Remove engine cover.

-- If equipped, remove the heat shield.

-- Release control module connector in direction of -arrow 1- and pull off -arrow 2-.

Fig 2: Identifying Control Module Connector

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-- Insert -V.A.G 1869/2-.

-- Attach bleeder hose of bleeder bottles to left front and left rear brake caliper bleeder valves and open bleeder valves.

-- Operate brake pedal using -V.A.G 1869/2- at least 60 mm.

-- Close left front and left rear bleeder valves.

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

-- Place sufficient lint-free cloths under the control module and hydraulic unit.

Make sure that brake fluid does not come in contact with the terminals.

-- First, mark both brake lines from master cylinder -A and B- and remove from the hydraulic unit.

Fig 3: Identifying Connection Of Brake Lines From Dual Brake Master Cylinder To Hydraulic Unit -- On Hydraulic Unit

Courtesy of VOLKSWAGEN UNITED STATES, INC.

-- Plug the brake lines and threaded holes immediately with sealing plugs from the repair kit Part No. 1H0 698 311 A.

-- Mark brake lines (brake caliper) -1 to 4-, remove and seal.

-- Remove the hex bolt from the bracket.

-- Remove the hydraulic unit, the control module and the retainer from the bracket rubber insulation and turn it on its head.

-- Remove the retainer from the hydraulic unit in the engine compartment.

-- Remove the hydraulic unit and the control module.