34 00 050 Bleeding brake system with DSC: Notes

WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT:

Read and comply with GENERAL INFORMATION .

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.

NOTE:

Connect bleeder unit with max. 2 bar filling pressure.

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

IMPORTANT:

Always use BMW-approved BRAKE FLUIDS .

Under certain circumstances it is not possible after the brake system is opened to bleed the brake system fully at the rear EMF brake calipers. If there is still residual air in the rear brake calipers after normal bleeding, it will be necessary to work through an ADDITIONAL BLEEDING PROCEDURE !

Connect BMW diagnosis system.

Select path: Service functions -

Chassis/Suspension - Slip control systems - Bleeding procedure.

Connect brake fluid changer to expansion tank and switch on.

IMPORTANT: 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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Fully rinse the brake system:

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: Locating Rear Right Brake Caliper Bleeder Valve

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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: Locating Rear Right Brake Caliper Bleeder Valve

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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: Connecting Bleeder Hose With Collecting Vessel To Bleeder Valve

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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: Locating Brake Fluid Level Mark (MAX)

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