Brake Fluid: Service and Repair

34 00 025 Replacing fluid in ABS/ASC-T brake system

Necessary preliminary tasks:
^ Read and comply with General Information.
^ Remove lower section of microfilter housing.

The clutch hydraulic system must also be bled in vehicles with manual transmissions.

Important! All vehicles with DSC without precharging pumps must be filled with the new DOT4 low-viscosity brake fluid!
All other models can be filled with the DOT4 or DOT4 low viscosity brake fluid.
When carrying out repairs to the brake system, follow the procedure set out in Bleeding brake system with DSC.





Connect bleeder unit to expansion tank and switch on.

Note: Check relevant Operating Instructions for each device.
Charging pressure should not exceed 2 bar.





Flushing brake system completely
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 bleed valve.
Follow same procedure on rear left, front right and front left wheel brake.





Switch off brake fluid changer and remove from expansion tank.
Check brake fluid level.
Close expansion tank.

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