Bleeding Brake System With DSC3

Note: Follow general instructions:

In case of replacement or repair, the filling and bleeding instructions for the following components must be observed:
1. Tandem master brake cylinder
2. Hydraulic unit DSC3
3. and components/connecting lines installed between these units.
For other operations on the brake system (e.g. replacing brake calipers), the specification "Bleeding brake system with ABS/ASC+T" must be observed:
Only the front-axle circuit has to be bled after work on the precharging pump. Activate precharging pump once with Diagnosis and Information System (DIS).
(Brake fluid changer connected with max. 2 bar filling pressure).
After completing work: Carry out final check with DIS under menu item "Service functions".
Contrary to the instructions in DIS, the bleeding procedure must be restarted on each wheel.





Connect DIS.
Call up service function "Bleeding ABS/DSC3 Hydraulics".
Connect brake fluid changer to expansion tank and switch on.

Note: Check relevant operating instructions for each device. Charging pressure must not exceed 2 bar.





Flushing brake system completely
Attach bleed hose with container to bleed valve on rear right brake caliper.
Open bleed valve and flush until clear, bubble-free brake fluid emerges.
Close bleeder valve.
Follow same procedure on wheel brakes rear left, front right and front left.





Bleeding rear-axle brake circuit
Attach bleed hose with container to bleed valve on rear right brake caliper.
Open bleed valve.
Allow bleeding procedure with DIS to take its course with bleed valve open.
After procedure is completed, press brake pedal down fully 5 times; clear, bubble-free brake fluid must emerge.
Close bleeder valve.
Repeat procedure at rear left.





Bleeding front-axle brake circuit
Attach bleed hose with container to bleed valve on front right brake caliper.
Open bleed valve.
Allow bleeding procedure with DIS to take its course with bleed valve open.
After procedure is completed, press brake pedal down fully 5 times; clear, bubble-free brake fluid must emerge.
Close bleeder 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.