Replacing the ABS Hydraulic Modulator and Control Module

Replacing the ABS hydraulic modulator and control module

Note! For service work, the modulator is supplied with the control module. The secondary modulator circuit is filled with brake fluid. The circuit is internally bled so that the brake system can be bled in the normal way after assembly.

Removal

Preparations
Ignition off.

Removing the control module





Note! Clean the modulator thoroughly

Note! Put rags under the modulator to prevent brake fluid spilling onto painted surfaces.

- Remove the first three mounting clamps (B) for the brake pipes on the fender liner and cowl panel
- Disconnect the brake pipes (F) on the modulator
- Collect the brake fluid
- Plug the pipes
- Detach the hoses (A) on the fender liner at the modulator
- Detach the reservoir (C) for the power steering system. Leave the reservoir hanging from the hose.
- Separate the control module connector by pulling out the locking arm (D)
- Remove the 2 nuts (E) holding the modulator
- On diesel engines the engine control module (ECM) can be detached and lifted to the side.

Release the hydraulic modulator and the control module

Note! Be careful with the brake pipes and the pump motor cable positioned under the hydraulic modulator.

- Lift the brake pipes past the bracket for the fluid reservoir
- Carefully lift the hydraulic modulator
- Locate the 3 rubber dampers and the 2 mounting lugs.

Installation

Installing the hydraulic modulator and the control module




- Carefully lift in the hydraulic modulator
- Install the 3 rubber dampers and the 2 mounting lugs
- Install the hydraulic modulator
- Tighten the 2 nuts. Tighten to 25 Nm (E).
- Assemble the connector for the control module (D)
- Install the mounting clamps (B) for the brake pipes. Ensure that the brake pipes are correctly positioned in the rubber holder
- Install the brake pipes. Tighten to 14 Nm (F)
- Screw the fluid reservoir (C) for the power steering system into place
- Install the hose mounting and hoses on the fender liner at the hydraulic modulator (A).
Wash away any spilled brake fluid with warm water and car shampoo.
Bleed the brake system according to Bleeding brake system Service and Repair

Checks after finishing work
- Read off and erase any diagnostic trouble codes (DTCs)
- Test drive the car according to Test driving Initial Inspection and Diagnostic Overview
- Check whether any diagnostic trouble codes (DTCs) have been stored.