34 00 050 Bleeding brake system with DSC

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Necessary preliminary work:

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 and Suspension - Traction control system - 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

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Completely bleed the brake system:

Connect vent hose with collecting vessel 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: Locating Vent Valve On Rear Right Brake Caliper (1 Of 2)

Courtesy of BMW OF NORTH AMERICA, INC.

Bleed the rear axle brake circuit:

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

Open bleeder valve.

Run bleeding procedure with DIS (BMW scan tool) with 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: Locating Vent Valve On Rear Right Brake Caliper (2 Of 2)

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 Vent Hose With Collecting Vessel To Vent Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Run brake bleeding procedure using the DIS (BMW scan tool) with 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 gasket (1) in sealing cap.

Fig 5: Identifying Gasket And Brake Fluid Level

Courtesy of BMW OF NORTH AMERICA, INC.