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occasional humming from front during braking 850 1997

posted by  someone claiming to be Aaron on  Fri Dec 29 08:18 CST 2000 [RELATED]

Hi everyone. I'm hoping someone can help me figure this out. My wife and I recently purchased a '97 850 wagon with about 50K on it. It's been a great car so far. Occasionally, during braking, we'll hear a humming noise coming from the front right of the car. The noise doesn't happen everytime we stop. When it does occur, it happens right at the very end of the stop, I'd say about 2 seconds before we're completely stopped. Perhaps by total coincidence, the noise started about a week ago when the weather started getting a little colder here (20 degrees or so at night and 35 or so during the day). During a typical day, the noise might occur during the first five or so times that I use the brakes, but won't occur again for the rest of the day.

I took it to the service garage where we bought the car and the mechanic could not recreate the noise. He suggested that it's probably the ABS pump building up pressure(?) He said he's sure it's nothing to worry about. While his explanation doesn't satisfy me, I have no clue what it might be.

Interestingly, I found a post from a few years ago describing the same phenomenon in a '96 850. Unfortunately, no one responded to that post. (Here's the link: http://brickboard.com/ARCHIVES/1997DEC/6261.shtml).

Any thoughts?

Thanks!

Aaron





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