34 00 025 Replacing fluid in ABS/ASC+T brake system

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Read and comply with General Information .

IMPORTANT: When carrying out repairs to the brake system, follow the procedure set out in Bleeding brake system with DSC .

Unclip retaining tabs (1).

Pull cover (3) out of guide (2) and remove.

Fig 1: Identifying Retaining Tabs And Guide

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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 2: 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 3: Connecting Bleeder Hose With Collecting Tray To Bleeder Valve

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NOTE: The clutch slave cylinder must also be scavenged in vehicles with manual transmissions.

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 4: Identifying Brake Fluid Level And Sealing Cap Rubber Seal

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After installation:

Reset CBS display according to factory specification