34 00 050 Bleeding brake system with DSC

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove left sensor opening.
Read and comply with GENERAL INFORMATION .

IMPORTANT: When replacing or repairing, observe the filling and bleeding instructions for the following parts:

Tandem brake master cylinder
Hydraulic unit
Components and 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.

Only use approved BRAKE FLUIDS .

Connect DIS (BMW scan tool).

Select path: Service functions -

Chassis/Suspension - Traction control systems - Bleeding procedure.

IMPORTANT:

Check relevant equipment manufacturer's operating instructions for each device.

Charging pressure should not exceed 2 bar.

Connect bleeder unit to expansion tank and switch on.

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 bleeder valve.

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

IMPORTANT:

In vehicles with 6-piston fixed caliper brakes two bleeder valves per brake caliper are installed on the front axle!

In each case start by bleeding at the outer bleeder valve and then bleed at the inner bleeder valve.

Fig 2: Connecting Bleeder Hose With Collecting Tray To Bleeder Valve On Rear Right Brake Caliper

Courtesy of BMW OF NORTH AMERICA, INC.

Bleed the rear axle brake circuit:

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Open bleeder valve.

Run brake bleeding procedure using the DIS (scan tool) with the bleeder valve open.

After completing routine, press brake pedal 5 times to floor. Clear and bubble-free brake fluid must flow out.

Close bleeder valve.

Repeat procedure at rear left.

Fig 3: Connecting Bleeder Hose With Collecting Tray To Bleeder Valve On Rear Right Brake Caliper

Courtesy of BMW OF NORTH AMERICA, INC.

Bleed front-axle brake circuit:

Connect bleeder hose with collecting tray to bleeder valve on front right brake caliper.

Open bleeder valve.

IMPORTANT:

In vehicles with 6-piston fixed caliper brakes two bleeder valves per brake caliper are installed on the front axle!

In each case start by bleeding at the outer bleeder valve and then bleed at the inner bleeder valve.

Fig 4: Connecting Bleeder Hose With Collecting Tray To Bleeder Valve On Front Right Brake Caliper

Courtesy of BMW OF NORTH AMERICA, INC.

Run brake bleeding procedure using the DIS (BMW scan tool) with the bleeder valve open.

After completing routine, press brake pedal 5 times to floor, clear and bubble-free brake fluid must flow out.

Close bleeder valve.

Repeat procedure at front left.

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 5: Locating Brake Fluid Maximum Level

Courtesy of BMW OF NORTH AMERICA, INC.