sbr,

It would seem the brake fluid is running out somewhere. In my 1982 240D this happened and it took me a few days to figure out it was the hydraulic cylinder at the brake pedal (edit: that was the clutch pedal and you have an automatic, so you do not have a clutch pedal - sorry). The fluid did not leak on the street or driveway, it leaked on the floor. I ended up flushing the floor area with water to clean the stuff out, but it ruined the bottom of the rug (the molded/contoured stuff that fits around the ducts and wireways that go under the rug) and was a huge pain to replace. I am over six feet tall and just did not fit very well under the dashboard. Good Luck and I hope this helps. Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)