Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Control Module And Hydraulic Unit, Mark 70
Beginning with MY 09, the ESP sensor unit G419 is inside the ABS control module -J104-.
Beginning with MY 09, the ABS control module must be replaced if the ESP sensor unit is faulty.
Beginning with MY 09, the ABS control module must be calibrated if it was replaced.
Beginning with MY 09, the steering angle and the braking pressure are stored in the ABS control module and must be calibrated.
Special tools and workshop equipment required
- Torque Wrench V.A.G 1331
- Torque Wrench V.A.G 1410
- Brake Pedal Actuator V.A.G 1869/2
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 covered for hydraulic units without transport protection.
1 - Transport protection for valve domes (foam)
2 - Sealing plugs M10 for brake lines and threaded bores
3 - Sealing plugs M12 for brake lines and threaded bores
Removing
-- If equipped, remove the covers at right rear of engine compartment.
-- Install the V.A.G 1869/2 between the brake pedal and driver seat. Depress the brake pedal a minimum of 60 mm.
-- Connect the hose of a bleeder bottle to the bleeder screws of the left front and left rear brake calipers, and open the bleeder screws.
This lowers the pressure in the hydraulic unit.
-- Close the left front and left rear bleeder screws.
-- Do not remove V.A.G 1869/2.
-- Release control module harness connector -arrow 1- and pull off -arrow 2-.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.