Volkswagen Golf Service & Repair Manual: Separating control unit from hydraulic unit

Volkswagen Golf Service & Repair Manual / Brake system / ABS, ADR, TCS, EDL, ESP / Control unit and hydraulic unit / Separating control unit from hydraulic unit

Special tools and workshop equipment required

ESD workplace -VAS 6613-

Torx bit T25

If a control unit is defective, separate it from the hydraulic unit and renew only the control unit.

If the hydraulic unit is defective, the hydraulic unit must be renewed together with the control unit.

To separate the control unit from the hydraulic unit, the ESP unit must be removed first.

Risk of damage to hydraulic unit caused by removal of the return flow pump.Never detach the return flow pump from the hydraulic unit.Risk of damage to control unit caused by static charge and dirt.Discharge any static charge: touch an ESD workplace.Protect interior of control unit from moisture and dirt.

–	Before working on electric components, touch an earthed object, ESD workplace -VAS 6613-. Do not directly touch connector contacts or electronic components.

–	Lay down hydraulic unit together with control unit on ESD workplace -VAS 6613-.

–	Unscrew the 3 Torx bolts from control unit and lay them aside immediately (to avoid interchanging with the new Torx bolts).

–	Set hydraulic unit with control unit facing upwards on ESD workplace -VAS 6613-.

–	Taking care not to cant control unit, pull it off hydraulic unit.

–	Cover control unit solenoids with a lint-free cloth.

–	Check cleanliness of hydraulic unit sealing surface; clean with methylated spirits and a lint-free cloth if necessary.

The sealing surface of the hydraulic unit may not be worked with a file, metal scraper, sandpaper or similar.

If the sealing surface of the hydraulic unit is damaged (e.g. scoring, scratches), the hydraulic unit must be renewed together with the control unit.

The seal of the control unit may not be pulled out or raised.

The seal of the control unit cannot be renewed.

Separating control unit from hydraulic unit

Removing and installing control unit and hydraulic unit, RHD vehicles

Special tools and workshop equipment required Torque wrench -V.A.G 1331- Torque wrench -V.A.G 1410- Brake pedal depressor -V.A.G 1869/2- ...

Fitting control unit to hydraulic unit

Special tools and workshop equipment required ESD workplace -VAS 6613- Torque screwdriver -V.A.G 1624- ...

Other materials:

Using the vehicle in other countries and continents
First read and observe the introductory information and safety warnings The vehicle has been manufactured specifically for a particular country and complies with the registration regulations that applied in that country at the time of vehicle production. If the vehicle is going to be sold ...

Checking fuel system for leaks
Special tools and workshop equipment required Fuel system tester (so-called smoke tester) -KLI 9210- Adapter hose -KLI 9210/55-1- Hose clamps up ...

Detecting leaks in refrigerant circuit using leak detecting system -VAS 6196- or leak detecting system -VAS 6201- or a later model
Note Small leaks can be detected with, for example, an UV leak detector additive. – Evacuate refrigerant circuit using an air conditioner service station → Chapter. Note ...