34 00 050 Bleeding brake system with DSC

WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: High-voltage system - danger to life!

WARNING: Compliance with the following points is mandatory before beginning work:

Observe SAFETY INSTRUCTIONS for handling hybrid cars

Necessary preliminary tasks:

IMPORTANT: When replacing or repairing, observe the filling and bleeding instructions for the following parts:

Tandem brake master cylinder
Hydraulic unit
Components and connecting lines which are fitted between these assemblies.
For E72: SBA control unit

Connect bleeder unit with max. 2 bar filling pressure.

A second person is needed to help carry out this work.

Use only BMW-approved brake fluids, see APPROVED BRAKE FLUID .

Connect DIS.

Select path: Service functions - Chassis/Suspension - Traction control systems - Bleeding procedure.

IMPORTANT: Check relevant equipment manufacturer's operating instructions for each device.
Charging pressure should not exceed 2 bar.

Connect brake fluid changer to expansion tank and switch on.

Fig 1: Connecting Brake Fluid Changer To Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Fully rinse the brake system:

Connect vent hose with collecting vessel to vent valve on rear right brake caliper.

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

Close vent valve.

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

Fig 2: Locating Bleeder Valve On Rear Right Brake Caliper

Courtesy of BMW OF NORTH AMERICA, INC.

Bleeding rear axle brake circuit:

Connect vent hose with collecting vessel to vent valve on rear right brake caliper.

Close vent valve.

Run brake bleeding procedure with DIS with vent valve open.

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

Fig 3: Locating Bleeder Valve On Rear Right Brake Caliper

Courtesy of BMW OF NORTH AMERICA, INC.

Close vent valve.

Repeat procedure at rear left.

Bleeding front axle brake circuit:

Connect vent hose with collecting vessel to vent valve on front right brake caliper.

Close vent valve.

Run brake bleeding procedure with DIS with vent valve open.

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

Fig 4: Bleeding Front-Axle Brake Circuit

Courtesy of BMW OF NORTH AMERICA, INC.

Close vent valve.

Repeat procedure at front left.

Switch off brake fluid changer and remove from expansion tank.

Check brake fluid level. If necessary, top up/draw off to max. level.

Close expansion tank.

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

Fig 5: Locating Brake Fluid MAX Level

Courtesy of BMW OF NORTH AMERICA, INC.