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Phantom Vibration 850

posted by  someone claiming to be Kyle Dorr on  Mon Sep 1 14:39 CST 2003 [RELATED]

I've got a 97 850R Wagon with 125K. Recently, I've been having a rather scary vibration from what I think is the rear-end of the car under repeated braking-- like if I was in traffic where I was stopping a lot. It is WICKED loud and vibrates the whole car.

The vibration is very constant -- like one frequency. It almost seems like the ABS is pulsating, but there is no feedback in the pedal. I tested the ABS theory by removing all 3 fuses with any reference to the ABS system so it would be inactive. No effect.

I changed the rear brake pads (I thought they might be faulty or something) and nothing changed.

I took off the summer tires and put on the winter ones (maybe something wrong with the plies in the tires) and nothing changed.

The tires are another problem -- noticed what seems to be tread separation on the drivers side front summer tire (Kumho Exsta 712) when I did the changeover to the winters. Going to have that replaced... It's the 2nd time I've noticed that! The previous one was on the original Pirelli PZeros on the passenger front side almost 2 years ago.

What do you think??? This is an interesting one.








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    Phantom Vibration 850

    posted by  someone claiming to be billh on  Tue Oct 14 02:08 CST 2003 [RELATED]

    I also have this problem, but it most frequently occurs after rain for the first couple of stops. Then it goes away. I have also had it occur after driving on the freeway, but much less regularly. Any similarity to your symptoms.








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    Phantom Vibration 850

    posted by  Rick850R on  Tue Sep 2 14:06 CST 2003
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

    I can bet I know the answer.

    I have a 97 850-R that had the same problem. It actually is the brakes--not the rotors per se, but the pads. They make the car shudder like an aircraft does when slowing down on the runway.

    Long story short, get OEM Volvo pads and your problem should disappear. OEM pads are softer than aftermarket pads which is what I am willing to bet you have on there now.

    If you feel the need to swap out rotors too, then do this: I just changed mine with no problems: Go to www.fcpgroton.com and buy Brembo equivalent rotors and OEM Volvo pads. The whole thing for the rear will cost you under $100, the front a bit more. Your problem will disappear.







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    Phantom Vibration 850

    posted by  someone claiming to be Frank on  Mon Sep 1 16:12 CST 2003 [RELATED]

    From here, I'd say that you need new rear brake rotors as they're probably warped. Do be sure that all calipers are OK (no sticking pistons).








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      Phantom Vibration 850

      posted by  someone claiming to be Kyle Dorr on  Tue Sep 2 01:37 CST 2003 [RELATED]

      I'm not sure it's warped rotors - the vibration I'm feeling is only when the brakes have been "heated up" and the vibration shakes the WHOLE car! Like if you were driving 90 mph down the breakdown lane and are running thru those rumble strips on the edge of the road. It's really quite scary. No vibration feedback thru the pedal or the steering wheel... thru the whole body of the car... yes. Did I say it was REALLY LOUD? It literally buzzes almost everything in the car near the back when it happens.

      How can one tell if there are sticking pistons in the calipers?








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        Phantom Vibration 850

        posted by  someone claiming to be Kyle Dorr on  Wed Sep 3 02:58 CST 2003 [RELATED]

        Well, I'm going to eat my words. I stopped into the local dealer and had the mechanic ride with me. As soon as it made "the noise" he said: Do you have the shim kit? (Meaning the updated half-shims). Needless to say, when we got back to the service department, I bought the shim kit. I'm going to replace the rotors while I'm at it. I'll reply again if this doesn't fix the problem, but you can all assume it did if I do not report back.

        I really need to pay more attention to volvospeed.com's Bay 13 section...there's a mention of the shim update in the "rear brakes" section.








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      Phantom Vibration 850 1995

      posted by  steve s on  Mon Sep 1 18:47 CST 2003
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      last visit: Thu Mar 10 02:18 CST 2011
      [RELATED]

      yeah, i second that... since u've tried new rim/tire combo... one last thing, is the vibration u feel in the seat or the steering wheel? it'd be rear for the former and front for the latter...







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