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.
Vehicles With Dynamic Stability Control (DSC)
Perform the following filling and bleeding procedure when exchanging or repairing tandem-brake master cylinder, hydraulic control unit for Dynamic Stability Control (DSC) and components, or connecting lines installed between these units. When carrying out any other work on brake system (e.g. replacing brake calipers), see BASIC BLEEDING PROCEDURES .
After work has been completed on the precharging pump, only the front-axle brake circuit has to be bled. Activate precharging pump once with Diagnosis and Information System (DIS). (Brake fluid changer connected to maximum 2 bar filling pressure). After completing work, carry out final check with DIS under menu item SERVICE FUNCTIONS. Contrary to the instructions in the DIS, the bleeding routine must be restarted on each wheel. A second person is needed to help carry out this work.
- Connect BMW Diagnosis and Information System (DIS).
- Using DIS, call up service function BLEEDING ABS/DSC3 HYDRAULICS.
- Connect bleeding unit to expansion tank and switch on.
- Flush entire braking system.
- Connect bleeder hose with container to bleed valve on rear right brake caliper.
- Open bleed valve and flush until clear, bubble-free brake fluid emerges.
- Close bleeder valve.
- Follow same procedure on rear left, front right and front left in that order.
- Bleed front or rear axle brake circuit.
- Connect bleeder hose with container to bleed valve on right brake caliper.
- Open bleed valve.
- Run bleeding routine with BMW Diagnosis and Information System (DIS) with bleeder valve open.
- After running routine, press brake pedal 5 times to stop. Clear, bubble-free brake fluid must flow out.
- Close bleeder valve.
- Repeat procedure at left caliper.
- Switch off bleeder unit and disconnect from expansion tank.
- Check brake fluid level.
- Close expansion tank. Take care of rubber gasket in lid.
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.