34 00 050 Bleeding brake system with DSC

WARNING: This page is about a different variant/trim than selected.

NOTE: Read and comply with General Information. Refer to 34 00 ... GENERAL INFORMATION . When replacing or repairing, observe the filling and bleeding instructions for the following parts:

Tandem brake master cylinder.
DSC hydraulic unit.
Components/connecting lines which are fitted between these assemblies.

(Brake fluid changer connected to max. 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 DIS.

Call up service function "Bleeding ABS/DSC Hydraulics".

Connect brake fluid changer to expansion tank and switch on.

NOTE: Check relevant operating instructions for each device. Charging pressure should not exceed 2 bar.

Fig 1: Connecting Brake Fluid Changer To Expansion Tank

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Flushing Brake System Completely:

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Open bleeder valve and purge until clear, bubble-free brake fluid emerges.

Close bleed valve.

Follow same procedure on rear left, front right and front left wheel brake.

Fig 2: View Of Bleeder Hose And Collecting Container (Rear Wheel)

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Bleeding Rear-Axle Brake Circuit:

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Close bleeder valve.

Run bleeding routine with DIS with bleeder valve open.

After completing routine, press brake pedal 5 times to floor; clear and bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at rear left.

Fig 3: View Of Bleeder Hose And Collecting Container (Rear Wheel)

Courtesy of BMW OF NORTH AMERICA, INC.

Bleeding Front-Axle Brake Circuit:

Connect bleeder hose with collecting tray to bleeder valve on front right brake caliper.

Close bleeder valve.

Run bleeding routine with DIS with bleeder valve open.

After completing routine, press brake pedal 5 times to floor, clear and bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at front left.

Fig 4: View Of Bleeder Hose And Collecting Container (Front Wheel)

Courtesy of BMW OF NORTH AMERICA, INC.

Switch off brake fluid changer and remove from expansion tank.

Check brake fluid level.

Close expansion tank.

NOTE: Pay attention to rubber seal (1) in sealing cap.

Fig 5: View Of Expansion Tank Rubber Gasket

Courtesy of BMW OF NORTH AMERICA, INC.