3400025 Replacing fluid in brake system

IMPORTANT: When carrying out repairs to the brake system, follow the procedure set out in BLEEDING BRAKE SYSTEM WITH DSC .

Only use brake fluids that have been approved by BMW, see BRAKES - OPERATING FLUIDS .

Unclip retaining tabs (1).

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

Fig 1: Locating Vent Valve On Rear Right Brake Caliper

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Connect brake fluid changer to expansion tank and switch on.

NOTE: Check relevant equipment manufacturer's operating instructions for each device.
Charging pressure should not exceed 2 bar.

Fig 2: Identifying Bleeding Arrangement

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Fully rinse 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.

Fig 3: Locating Vent Valve On Rear Right Brake Caliper

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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: Checking Brake Fluid Level

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After installation