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

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 BMW 335xi, 2008 BMW 335i, 2008 BMW 328xi, 2008 BMW 328i, and 2008 BMW 323i. 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 Brake System Retaining Tabs, Cover And Guide

G04725956

Courtesy of BMW OF NORTH AMERICA, INC.

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: Identifying Brake Fluid Changer

G04726562

Courtesy of BMW OF NORTH AMERICA, INC.

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: Identifying Rear Right Brake Caliper Bleeder Valve

G04726563

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Close expansion tank.

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

Fig 4: Identifying Expansion Tank, Brake Fluid Level And Sealing Cap Rubber Seal

G04726566

Courtesy of BMW OF NORTH AMERICA, INC.