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.
Location and repair
The DSC unit is located in the vehicle underbody, set back somewhat from the wheel arch. That location applies to both left and right-hand-drive vehicles.
| Index | Explanation |
|---|---|
| 1 | Quick-release hydraulic pipe unions, 4 off |
| 2 | Screw-fit hydraulic pipe unions, 6 off |
| 3 | DSC control unit |
| 4 | DSC valve manifold |
| 5 | DSC pump motor |
| 6 | DSC unit mounting bracket |
| 7 | Bolt fixing with vibration damper for DSC unit |
| 8 | Screw-fit hydraulic pipe unions, 2 off |
Six short lengths of hydraulic pipe are connected to the DSC unit by screw-fit unions.
Four of those hydraulic pipes run upwards from the hydraulic modulator and terminate at a block with quick-release unions. They are connected by those quick-release unions to the pipes running off to other parts of the vehicle. Specifically, that is the two pipes to the left and right front brakes and the two pipes to the tandem master cylinder.
The two remaining hydraulic pipes run to the rear. They are connected by quick-fit unions to the pipes running off to other parts of the vehicle. In this case, they lead to the left and right rear brakes.
If the DSC unit has to be replaced, first of all the vehicle underbody trim has to be removed in the appropriate places. When the DSC unit is removed, the six short lengths of hydraulic pipe referred to above are removed with it. Therefore, before removal, the four quick-release unions (4) and the two screw-fit unions (8) have to be disconnected. The short lengths of hydraulic pipe subsequently have to be removed and fitted to the new DSC unit.
Only after the DSC unit has been removed can the DSC control unit be separated from the hydraulic modulator, if necessary, and new one fitted.
The braking system must always be bled whenever the DSC unit has been removed and refitted/replaced.
The precise procedures for the individual repair operations in connection with the DSC unit are described in the Repair Instructions.
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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.