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, Separating From Hydraulic Unit
Special tools and workshop equipment required
- ESD Work Surface: VAS6613
- The ABS Hydraulic Unit -N55- with the ABS Control Module -J104- must be removed in order to separate the control module and the hydraulic unit.
- The return flow pump must not be separated from the ABS Hydraulic Unit -N55-.
Procedure
-- Remove the hydraulic control unit. Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .
There is a risk of destroying the control module through the electrostatic charge and reduced cleanliness.
- Discharge electrostatic charge: touch the electro-static discharge work surface
- Protect the inner control module from moisture and dirt.
-- Place the hydraulic unit with the control module on the : VAS6613 .
- The control module -2- faces upward and the hydraulic unit -4- with the pump motor and connector -3- faces down.
-- Remove the bolts -1- and dispose of them.
-- Carefully remove the control module vertically upward without tilting.
- Blowing the control module or hydraulic unit out with compressed air is not permitted.
- The valve bodies inside the hydraulic unit must not be damaged or bent.
-- Cover the open hydraulic unit with a lint-free cloth.
-- Check the hydraulic unit sealing surface, and if necessary, clean with mineral spirits and a lint-free cloth.
-- A damaged sealing surface must not be mechanically reworked. A hydraulic unit with a damaged sealing surface must be replaced.
Risk of damaging the control module due to improper handling.
- Do not remove or lift the seal.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.