With the Motive Pressure Bleeder you dont have to worry about the back part of the reservoir going dry. You can read up on this by searching my name. Although you are finished, you may want to buy this bleeder anyway, it works very nicely for the money.
Have fun with the rear wheel bearing, Id have someone do it, its a pain.
No Benzes in the stable at the moment, but itching for one again.
Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold