34 00 027 Replacing fluid in brake system

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NOTE: Read and comply with GENERAL INFORMATION .

Necessary preliminary tasks:

Remove left sensor opening

IMPORTANT: When carrying out repairs to the brake system, follow the procedure set out in BLEEDING BRAKE SYSTEM WITH DSC .
Use only BMW-approved brake fluids, see OPERATING FLUIDS .

Connect bleeder unit to expansion tank and switch on.

NOTE: Follow the applicable machine manufacturer's operating instructions.
Charging pressure should not exceed 2 bar.

Fig 1: Connecting Bleeder Unit To Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Completely bleed 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 vent valve.

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

IMPORTANT: In vehicles with 6-piston fixed caliper brakes two vent valves per brake caliper are installed on the front axle!
In each case start by bleeding at the outer vent valve and then bleed at the inner vent valve.

Fig 2: Connecting Hose To Bleeder Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Switch off bleeder unit 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 seal (1) in sealing cap.

Fig 3: Checking Brake Fluid Level

Courtesy of BMW OF NORTH AMERICA, INC.