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, Installing On Hydraulic Unit
Special tools and workshop equipment required
- ESD Work Surface: VAS 6613
- Torque Screwdriver: V.A.G 1624
- Torx socket T25
Excessive shaking (for example, dropping, impact) may destroy the control module. The control module must then no longer be used.
- Surfaces must be cleaned before assembling.
-- Place the control module on the hydraulic unit without tilting.
-- Using the provided Torx bolts, alternatingly tighten the hydraulic unit and the control module in two steps.
The hydraulic unit threads cannot be re-cut to secure the control module. If the threads are damaged, then the bolts are difficult to install by hand or the bolts cannot be tightened to the tightening specification. The hydraulic unit must be replaced.
Tightening Specification
- Tighten the new Torx bolts in two steps, switching back and forth.
- 1. Step: preliminary tightening specification: 1 Nm to 1.5 Nm (to position the seal)
- 2. Step: final tightening specification: 2.5 Nm
- Refer to OVERVIEW - CONTROL MODULE AND HYDRAULIC UNIT
A new control module may be installed a maximum of three times to a used hydraulic unit to ensure that the elastic seal seals sufficiently.
Do not install a used control module.
NO RELATED
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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.