Fill the expansion tank completely with fresh brake fluid and, while bleeding, constantly ensure that the fluid is added in a timely manner before the fluid level drops. Otherwise, air will be sucked in again.
Remove the dust cap from the bleed valve (sequence of working techniques: back right, back left, front right, front left) and open the valve by ½-1 turn (SW 9).
Place a clear hose over the cleaned fitting and lower the free end of the hose into a container partially filled with brake fluid.
Have your assistant slowly press and release the brake pedal until all air bubbles are gone from the hose. (If a lot of fluid has been drained from the brake system, then perform two cycles of bleeding the system.) This way, the brake fluid - and, of course, the air along with it - will be pumped out through the bleed valve.
If no more air bubbles are coming in, your assistant should hold the brake pedal in the lowest position while you close the bleeder valve. Tighten it carefully, otherwise the valve thread will be stripped (9 Nm).
Bleed the brakes on the other wheels in the same way.
Bleeding the brakes: The bleeding valve (1) is opened with a SW 9 key. A plastic hose (2) is placed on the valve and drains the pumped-out fluid into a prepared container (3).
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