Volkswagen ID.4: Separating control unit from and connecting to hydraulic unit

Special tools and workshop equipment required

• ESD workplace VAS 6613 International -VAS 6613-

ABS control unit -J104- is called control unit in this manual.

ABS hydraulic unit -N55- is called hydraulic unit in this manual.

Important

• If the control unit is defective, the control unit must be disconnected from the hydraulic unit and only the control unit renewed.
• If the hydraulic unit is defective, the hydraulic unit must be renewed together with the control unit.
• The seal of the control unit may not be pulled out or raised.

NOTICE

Risk of damage to hydraulic unit caused by removal of the ABS return flow pump.

Malfunction of hydraulic unit.

• Never detach the return flow pump from the hydraulic unit.

•  Remove control unit and hydraulic unit ⇒ Rep. gr. 45; Removing and installing ABS control unit [J104]/ABS hydraulic unit [N55].

NOTICE

Risk of damage to electrical components.

Electrostatic charge may damage electrical components.

• Work on electrical components must always be carried out at an ESD workplace.
•  Place control unit with hydraulic unit on ESD workplace -VAS 6613-.

Control unit with 3 bolts

• Unscrew bolts -1- to -3-.

All vehicles (continued)

Control unit with 4 bolts

• Unscrew bolts -1- to -4-.

All vehicles (continued)

• Pull off control unit -1- from hydraulic unit -2- evenly in direction of -arrows-.

• Cover hydraulic unit actuators -2- with a lint-free cleaning cloth.

Connect in reverse order of removal, noting the following:

Important

• If threads of the hydraulic unit are damaged, the hydraulic unit must be renewed.
• If hydraulic unit sealing surface is damaged by scoring or scratches, hydraulic unit must be renewed together with control unit.
• Seal on control unit must not be pulled out or lifted off.

• Clean sealing surfaces between hydraulic unit and control unit using lint-free cleaning cloth.

NOTICE

Risk of damage if installation is not carried out correctly.

Leakage between control unit and hydraulic unit.

• A new control unit must be installed only 3 times.
• Renew control units that have already seen use in a vehicle following removal.

• Place control unit evenly onto hydraulic unit.

Tightening torques

• ⇒ Rep. gr. 45; Assembly overview - control unit and hydraulic unit

Control unit and hydraulic unitConnecting brake lines to hydraulic unit