Abs Hydraulic Unit -N55- With Abs Control Module -J104-: Installing
Installation is the reverse of removal, with special attention to 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 with the ABS control module 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.
By performing the output check diagnosis, it can be determined if the line connections were interchanged.
-- Tighten all the brake lines -arrow- on the ABS hydraulic unit --.
| Component | Nm | |
|---|---|---|
| All brake lines to the hydraulic unit | 14 | |
-- Connect the electrical connector on the ABS control module.
-- Press the locking bracket down until it engages audibly.
-- Press the securing clip -1- down and engage it.
-- Remove the V.A.G 1869/2.
-- Bleed the brake system, refer to BRAKE SYSTEM, BLEEDING .
-- After securing the brake lines on the hydraulic unit, perform output diagnostic test mode.
By performing the output check diagnosis, it can be determined if the line connections were interchanged.
Use the vehicle diagnostic tester VAS 5051B or 5052 for this.
If ABS hydraulic unit -- was replaced, it must be coded.
Use the vehicle diagnostic tester VAS 5051B or 5052 for this.
-- On display, select:
- Chassis
- Brake System
- 001 - OBD-capable systems
- 003- Brake electronics.
-- Select the following functions on the display:
- ABS/ASR/ESP control module J104
- ABS/ASR/ESP control module J104, functions
- J104 Coding control module
The Following Sensors Should Also be Calibrated After Replacing ABS control module.
- Steering Angle Sensor G85
- Transverse Acceleration Sensor G200
- Longitudinal Acceleration Sensor G251
Use the vehicle diagnostic tester VAS 5051B or 5052 for this.
-- On display, select:
- Chassis
- Brake System
- 001 - OBD-capable systems
- 003- Brake electronics.
-- Select the following functions on the display:
- ABS/ASR/ESP control module.
- ABS/ASR/ESP control module functions.
-- Then perform the ESP driving and system test.