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bad vibration 850 1997

posted by  someone claiming to be baumer on  Tue May 2 08:21 CST 2006 [RELATED]

I have a strange vibration issue on my 97 855. Mother in law has been driving it for a few months and recently complained about vibration. Here's the summary:
No vibrations at lower speeds then as soon as I get it above 65, get a unusual humming noise, then vibration in the suspension. Doesn't seem to be affecting the steering. Apply the brakes at this speed and I get serious pulsing. When tires cold, no vibration, no pulsing until high speed. After that, get vibration at any speed, and brake pulsing. I know what bad rotors feel like, and this is seems like a combination of that and vibration without braking. I had the tires balanced again (only 4k on them), no change. I'm thinking possibly bad tire (rear?). I also pulled wheels and rotated. Can't tell a difference. Suspention components look OK, no obvious probs. Any recommendations on next step?
Thanks.








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    bad vibration 850 1997

    posted by  someone claiming to be baumer on  Wed May 3 01:05 CST 2006 [RELATED]

    Thanks guys. Drove it a little last night and noticed the RF wheel was hot. Caliper is sticking. Wheel wouldn't budge when lifted off the ground. Moved the shoes off the rotor as much as I could and the wheel began to turn. I'll tackle that first and hopefully that will fix it. Funny though that it didn't seem to pull. I guess it could be that and the bearing, but don't want to change out the bearing unless I have to. The boots are old, but intact (for now).








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    bad vibration 850 1997

    posted by  TomL on  Tue May 2 16:23 CST 2006
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    last visit: Sun Jul 25 18:24 CST 2010
    [RELATED]

    The humming noise is probably bad front bearings. Sometimes you can feel it in the throtle, with slippers on. If it is you can tell which side it's on by noting how the pitch changes when turning. I use a stethescope (automotive type) to listen to them when it is on jack stands.
    I just replaced the right one on my 96.
    The pulsing brake is most likely bad rear rotors. The sevarity changes with the weather, speed, temperature, humidity, amount of pressure applied, number of persons in the car, etc. Rplace the rotors. Easy job.
    Front bearing hub replacement is a little tougher.
    Good luck
    --
    Tom 69-1800S, 72-1800ES, 96-850T,2000-S70 GLT-SE








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    bad vibration 850 1997

    posted by  KlausC on  Tue May 2 13:06 CST 2006
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    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    Recheck your brakes. It sounds like one of them is dragging a little and as the heat builds up, so does the drag. Probably in the rear. The e brakes do tend to delaminate with age and start falling apart. Also check all of the CV boots for tears.

    Klaus
    --
    (V♂LV♂s 1975 164, 1995 854T, 1998 V70R)







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