Bleeding Brake System With DSC

34 00 050 - Bleeding brake system with DSC





Necessary preliminary tasks:
- Read and comply with General Information Service and Repair
- Remove air duct from microfilter on left Removing and Installing/Replacing Left or Right Microfilter Air Duct

Observe safety instructions on raising the vehicle 00 .. ... Lifting Vehicle With A Lifting Platform.





Observe filling and bleeding instructions when replacing or repairing:

- Brake master cylinder
- Hydraulic unit
- Components and connecting lines which are fitted between these assemblies.
- Precharging pump
After work has been carried out on the precharging pump, only the front-axle brake circuit has to be bled. Before flushing the brake system, activate the precharging pump once with the Diagnosis and Information System (DIS) (bleeder unit connected with max. 2 bar filling pressure).





- Connect BMW Diagnosis and Information System (DIS).
- Call up service function for bleeding DSC hydraulics.
- 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.





Bleeding rear-axle brake circuit

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

Close bleeder valve.

Run through bleeding routine with BMW Diagnosis and Information System (DIS) with bleeder valve open.

After routine has finished, press brake pedal 5 times down to floor; clear bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at rear left.





Bleeding front-axle brake circuit

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

Close bleeder valve.

Run through bleeding routine with BMW Diagnosis and Information System (DIS) with bleeder valve open.

After routine has finished, press brake pedal 5 times down to floor; clear bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at front left.





Switch off brake fluid changer and remove from expansion tank.

Check brake fluid level.

Close expansion tank.

Note:
Take care of rubber gasket (1) in lid.