VW Golf manuals

Volkswagen Golf Service & Repair Manual: 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.
Return flow pump must not be separated from hydraulic unit.
Printed circuit board is exposed when control unit is removed.
Neither moisture nor particles of dirt may enter the interior of the control unit.
Avoid electrostatic charge!
This electrostatic charge can cause malfunctions if you touch electric components.
–  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

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