Replacing fluid in brake system (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

NOTE: Read and comply with GENERAL INFORMATION .
The capacities are oil change QUANTITIES , or refer to the "Fluid Capacities" tab for the selected vehicle

Necessary preliminary work:

Remove the left engine compartment COVER .

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 QUANTITIES , or refer to the "Fluid Capacities" tab for the selected vehicle.

Connect bleeder unit to expansion tank (1) and switch on.

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

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Completely bleed the brake system .

Connect vent hose (1) with collecting vessel to vent 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 .

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NOTE: Additionally flush the clutch slave cylinder in vehicles with manual gearbox.

Switch off bleeder unit and remove from expansion tank.

Check brake fluid level. If necessary, top up/draw off to "Maximum" level.

Close expansion tank.

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

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