Control Module And Hydraulic Unit, Removing

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

Special tools and workshop equipment required

Brake Pedal Actuator V.A.G 1869/2

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

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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 plugs M10.

3 - Sealing plugs M12.

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.

-- Disconnect the battery. Refer to [For transmission(s) 0A4, 02E, 09G, 02Q] [For engine(s) CBTA, CJAA, CBUA] Removal and Installation .

-- Remove engine cover.

Additional work on the following engines:

Diesel engines without and with a particulate filter:

-- Remove the plenum chamber cover. Refer to Description and Operation .

-- Remove the plenum chamber bulkhead. Refer to Description and Operation .

Diesel engines with particulate filter:

-- Disconnect the connector for the Exhaust Gas Temperature (EGT) Sensor 4 -G648- -2- and Heated Oxygen Sensor (HO2S) -G39- -3-.

Fig 2: Disconnecting Sensors -1 Through 3-

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-- Unclip the Exhaust Gas Temperature (EGT) Sensor 4 -G648- and Heated Oxygen Sensor (HO2S) -G39- cables from the brackets on the plenum chamber and engine.

-- Disconnect the connector on the Exhaust Pressure Sensor 1 -G450-.

-- Remove engine cover. Refer to [For transmission(s) 0A4, 09G] [For engine(s) CBTA, CBUA] Removal and Installation or refer to [For transmission(s) 02E, 02Q] [For engine(s) CJAA] Removal and Installation .

-- Remove the particulate filter bracket bolt -1-.

Fig 3: Identifying Particulate Filter Bracket Bolt

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-- Raise vehicle.

-- Loosen and remove the turbocharger/particulate filter clamp -1-.

Fig 4: Identifying Turbocharger/Particulate Filter Clamp

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NOTE:

The illustration shows the clamp bolt -1- from underneath. In some cases, this can be installed from the top.

-- Remove exhaust system bracket from subframe -arrows-.

Fig 5: Identifying Heat Shield Bolts

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-- Remove the bolts -1- and remove the drive axle cover -2-.

Fig 6: Identifying Bolts And Drive Axle Cover

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-- Disconnect the right drive axle from the flange, lay it down and secure it.

-- Loosen the double clamp on the exhaust pipe and push it toward the rear.

-- Remove the nuts -1 - and lower the particulate filter.

Fig 7: Identifying Nuts And Particulate Filter Bracket

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-- Remove the nuts -2- and remove the particulate filter bracket -3-.

-- Lower the particulate filter just enough so that it touches the steering gear.

NOTE:

While lowering the particulate filter, pay close attention to the cable, the Exhaust Gas Temperature (EGT) Sensor 4 -G648- and the Heated Oxygen Sensor (HO2S) -G39- to prevent damage.

-- Lower vehicle.

All Vehicles

-- Remove the nuts -1- and remove the heat shield -2- if equipped.

Fig 8: Identifying Nuts And Heat Shield

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-- Release and remove connector from control module in -direction of arrow-.

Fig 9: Identifying Direction To Release And Remove Connector From Control Module

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-- Install 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 of master brake cylinder -A- and -B- and unscrew from hydraulic unit.

Fig 10: Identifying Connection Of Brake Lines From Dual Brake Master Cylinder To Hydraulic Unit -- On Hydraulic Unit

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-- Seal brake lines and threaded holes immediately with Sealing Plugs 1H0 698 311 A.

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

-- Pull hydraulic unit with control module upward out of shock absorbers in -direction of arrow-.

Fig 11: Identifying Hydraulic Unit With Control Module Upward Removed Out Of Shock Absorbers

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