ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING: Installing
Install in reverse order of removal while noting the following:
For customer service, the hydraulic unit N55 is filled with brake fluid.
Remove the sealing plugs on the new hydraulic unit N55 when the corresponding brake line is going to be installed.
If the sealing plugs are removed from the hydraulic unit N55 before installing the corresponding brake line, the brake fluid will drain. If that is the case, sufficient brake system bleeding can no longer be ensured.
All the rubber buffers must be inserted in the bracket.
-- Press the hydraulic unit N55 with the control module J104 down into the bracket in the vehicle.
When pressing the ESP control unit into the bracket, counterhold the rubber buffers so they do not fall through.
-- Connect the brake lines according to the markings.
If the brake line connectors are replaced, an ABS/ESP system malfunction will register.
-- Tighten all the brake lines -arrow- on the hydraulic unit N55.
-- After securing the brake lines on the hydraulic unit N55, perform output diagnostic test mode.
By performing the output check diagnosis, it can be determined if the connections were interchanged.
-- Connect the electrical connector on the control module J104.
-- Press the locking bracket down until it engages audibly.
-- Press the securing clip -1- down and engage it.
-- Remove the Brake Pedal Actuator VAG1869/2.
-- Refer to HYDRAULIC SYSTEM, BLEEDING
-- If the ABS Control Module -J104- /ABS Hydraulic Unit -N55- is replaced, select the function "Replacing" in "Guided Functions " of the ABS Control Module - J104- /ABS Hydraulic Unit -N55-, refer to Vehicle Diagnostic Tester.
-- Then perform the ESP driving and system test.
Make sure the brakes are working correctly before driving the vehicle for the first time.