Ordered a set of Russell Speed Bleeders from Summit Racing. They come in sets of two, so I ordered two sets. There are versions to fit all makes (Mercedes uses 8mm x 1.25).
What are they? Well, they are replacement bleeder valves for your calipers. They have a check valve built in them so that they let fluid out, but do not let air back in.
How do you use them? Replace all four bleeder valves with the speed bleeders. Tightened all of them (one on each caliper) and then open each one 1/4 turn. Fill your master cyl. up and pump the brakes 3 or 4 times. Fill the master cyl. up and repeat until you're satisfied all the air is out of your brakes. 3 or 4 cycles should do it. Make sure to top the resevoir off after every 3 or 4 pumps. You can even do this to flush your brake fluid. When you're finished, tighten all the bleeder valves and that's it. It makes cake work out of bleeding brakes and allows you to bleed all four brakes at once.

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85 300CD
83 300TD
78 240D (daughter)