Completely fill the expansion tank with fresh brake fluid and during pumping, constantly monitor the timely addition of fluid before its level drops. Otherwise, the air will be sucked in again.
Remove the dust cap from the bleed valve (working sequence: rear right, rear left, front right, front left) and open the valve ½-1 turn (SW 9).
Put a transparent hose on the wiped fitting and lower the free end of the hose into a container partially filled with brake fluid.
Have your assistant slowly depress the brake pedal and release it until there are no air bubbles in the hose. (If a lot of fluid has been drained from the brake system, then make two passes to bleed the system.) So the brake fluid - of course, the air along with it - will be pumped out through the bleed valve.
If no more air bubbles come in, then your assistant should hold the brake pedal in the lowest position, while you close the bleeding valve. Tighten it carefully, otherwise the valve threads will be stripped (9 Nm).
Bleed the other wheels in the same way.
Brake bleed: bleed valve (1) opened with key SW 9. Plastic hose (2) is put on the valve and removes the pumped liquid into the prepared container (3).
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