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Old 05-24-2010, 09:21 AM
JimSmith JimSmith is offline
Join Date: Jul 2001
Location: Woolwich, Maine
Posts: 3,598
I believe the buttons have a test function and a reset function. It has been a long time, but I believe if the pedal goes to the floor there is a position switch that is set. You have to manually reset it by pressing the button on master cylinder until it "clicks" - unfortunately i cannot recall the exact procedure. Later models don't have the feature.

Your vacuum pump is probably fine if it makes vacuum and no noises that sound threatening.

Good luck, Jim
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

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)
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