No reverse-vacuum modulator problem - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 12-08-2006, 12:27 PM Thread Starter
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Date registered: May 2006
Vehicle: 2001 ML55
Location: wisconsin, USA
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No reverse-vacuum modulator problem

OK, My reverse doesn't work. About 1 out of 10 days it actually snaps in and it will work the whole day. It's not slipping or worn out, just doesn't snap in. I can unplug the vacuum line to the modulator valve and it works fine then, except for the really hard shifts. I tried turning the modulator adjustment both ways, but it didn't do anything except change the firmness of the shifts. Before I replace this valve, I was wondering what it really has to do with going into reverse, I thought it just was for firmness of shift points? Anybody know?
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post #2 of 3 (permalink) Old 12-10-2006, 01:04 PM
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sounds like u need a new trans, my 85 had no forward gear and it turns out to be a broken band in the transmission. u mite want to check/change ur trans fluid.

1993 MB 190E 2.3 105k- its alive.. 1996 Volvo 855 GLT-R 350k still rolling
1998 Subaru Outback SUS 210k- Daily Driver 2011 Toyota Camry XLE 36k
1991 BMW 525I stock as stock gets 98k (Wrecked) 1998 MB C230 209k possessed by the devil Crew
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post #3 of 3 (permalink) Old 12-11-2006, 04:53 AM Thread Starter
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I've changed fluid and filter many times. I don't believe the tranny is shot. Some days it goes into reverse fine. If I take the vacuum line off the modulater it works fine. I believe it's not getting pressure built up, like a sticky piston or broken spring in the valve body.
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