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.
DSC Unit: Versions
The DSC unit comprises the DSC control unit and the hydraulic modulator. The two are attached to one another in such a way as to form a waterproof unit.
The repair kits available are either
- the complete DSC unit with pre-filled hydraulic modulator or
- the DSC control unit on its own.
There is a seal integrated in the casing of the DSC control unit at precisely the point where it joins the hydraulic modulator. That is the reason why the DSC control unit can be replaced separately (seal is replaced at the same time). The hydraulic modulator, by contrast, can not be replaced separately because the seal would be damaged when the two parts were separated. The required degree of waterproofing would then no longer be provided.
There are two versions of the DSC unit which differ by virtue of the number of pressure sensors fitted.
| Optional extra ACC/ACC Stop&Go | Number of pressure sensors | Brake pressures measured |
|---|---|---|
| No | 1 | Pressure applied by driver |
| Yes | 3 | Pressure applied by driver Pressure in front-wheel brake circuit Pressure in rear-wheel brake circuit |
The DSC unit with only one pressure sensor uses a computation model to determine the pressures in the front and rear brake circuits. The degree of accuracy obtained is sufficient for the functions of the dynamic handling systems and the cruise control with braking function. The optional extras ACC and ACC Stop&Go require a higher degree of accuracy for determining the brake pressure generated and modulated by the Dynamic Stability Control. Therefore, the two additional brake sensors are fitted in the front and rear brake circuits.
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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.