34 00 050 Bleeding brake system with DSC

WARNING: This page is about a different car, the 2007 BMW 550i, 2006 BMW 550i, 2005 BMW 545i, and 2004 BMW 545i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary Preliminary Tasks:

Remove lower section of microfilter housing. Refer to 64 31 061 REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT MICROFILTER HOUSING LOWER SECTION .
Read and comply with General Information. Refer to 34 00 ... GENERAL INFORMATION .

Observe the filling and bleeding instructions when replacing or repairing:

Brake master cylinder.
Hydraulic unit.
Components and connecting lines which are fitted between these assemblies.

Connect bleeder unit with max. 2 bar filling pressure.

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

Connect BMW Diagnosis and Information System (DIS).
Select path: Service functions - Chassis/Suspension - Slip control systems - Bleeding procedure.
Connect bleeder unit to expansion tank and switch on.

IMPORTANT: Check relevant Operating Instructions for each device. Charging pressure should not exceed 2 bar.

Fig 1: Identifying Bleeder Unit Connected 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 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 through bleeding routine with BMW Diagnosis and Information System (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: Connecting Bleeder Hose With Rear Right Brake Caliper

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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 through bleeding routine with BMW Diagnosis and Information System (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 Right Brake Caliper

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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 Rubber Seal In Sealing Cap

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