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Old 05-24-2010, 09:21 AM
JimSmith JimSmith is offline
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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
__________________
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)
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