i just did a brake fluid flush on my w203 with auto trans. Actually I think I firmed up the pedal a bit by doing the change - supposedly dealer had done a change a while back but just to be certain i did it again.

make sure you have a good fender cover that is spill proof and a garden hose ready for action if brake fluid gets on ANY painted surfaces.

I had gone to HOME DEPOT and aquired a couple feet each of different clear hoses that I though's inner diameter would match bleeder nipple.

The hose that fit I attached one end to nipple and other into clear water bottle filled with old brake fluid. I only closed the bleeder when there were no more bubbles rising through old fluid in bottle.

I used a Speedi Bleed and had a spare bottle of mercedes brake fluid on stand buy. I had some pro.