The master cylinder won't self bleed. If air got into the master cylinder, get a MC bleed kit for lines that route back to the reservoir then 'bench bleed' the master cylinder, best done level. When free of bubbles, go back to bleeding the wheels. Since there are other German cars in the mix, a pressure bleeder is a worthwhile investment. If you're close to SJC you can borrow mine.

Sixto
98 E320s sedan and wagon