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Suspension, Brakes and Tires Discussion, Shake Shimmy STS in Item Specific Cadillac Discussion; tstach Before your brake job, were you experiencing the 60-75 mph shimmy/vibration? When driving over 75, did the shimmy disappear? ...
  1. #136
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    Re: Shake Shimmy STS

    tstach

    Before your brake job, were you experiencing the 60-75 mph shimmy/vibration? When driving over 75, did the shimmy disappear? While driving down the road, and the car was shimmying, did it just disappear, and reappear a short time after? This is the issue that we have. Not a constant vibration, that just keeps getting worse, the faster you drive. This is an annoying parasite that is sucking the bejesus out of me.

    Don

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    Re: Shake Shimmy STS

    Before the brake job, I had vibration from about 68MPH to about 78MPH. 80MPH and higher - no vibration.

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    Re: Shake Shimmy STS

    Quote Originally Posted by tstach
    Before the brake job, I had vibration from about 68MPH to about 78MPH. 80MPH and higher - no vibration.
    Thanks. I was actually considering swapping in a good set of rotors anyway. I cheaped out and got a lesser brand. My brakes vibrate on occassion, and the rotors may have warped again. So, hopefully , when I get around to doing this, it will solve the shimmy issue.

    Don

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    Re: Shake Shimmy STS

    I ordered a strut brace this evening. It only cost $29.91 from www.gmpartsdirect.com. I was looking all over the web for a brace, but could not find one. Ends up there was one under my nose the entire time. Cadillac makes one, and it is on my parts list. I was going to make one myself, which I am sure, would have cost me more than $30.00. Once it is in, I will post how it helps, or doesn't help. I am not expecting any good report. but, if I don't do it, I will always be wondering.

    Don

  5. #140
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    Exclamation Re: Shake Shimmy STS

    Please explain your discovery....part #....application....etc. Limo/ heavy duty part?

    Thanks...

    Logan Diagnostic
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    Re: Shake Shimmy STS

    Quote Originally Posted by Dadillac
    I ordered a strut brace this evening. It only cost $29.91 from www.gmpartsdirect.com
    That's odd that one is offered. Wondering why it wouldn't have been factory installed.

  7. #142
    JimD is offline Cadillac Owners Connoisseur
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    Re: Shake Shimmy STS

    Quote Originally Posted by Logandiagnostic
    Please explain your discovery....part #....application....etc. Limo/ heavy duty part?

    Thanks...

    Logan Diagnostic
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    I don't know where Dadillac got his information, but this picture is an export (Japan) STS from another post somewhere on this forum. Notice it is 2000 model or later as the engine has COP ignition. According to the other post, the brace part# is 25653157.

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    Re: Shake Shimmy STS

    Go to the Cadillac Tech Tips section of the forums. In there, at the top, is a sticky for '98-'04 parts list, that was posted my iametarq. Open it up, and open the link. When the pages load, look at page number 198. On the left side bottom, you will find the brace. I found this yesterday morning, and called a dealer. He was under the impression it was a support for the radiator. I kept looking at the pic all day, and know that this is the strut brace that is in those car pics. And at $30, I couldn't say no. It is worth a shot.

    Don

  9. #144
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    Exclamation Re: Shake Shimmy STS

    The Deville is set up a bit different then Seville.....

    Can someone measure the distance between the strut forward bolts?

    On the Deville, I'm showing 44 inches...see picture.

    I want to know if it is the same distance as the Seville before ordering the strut brace.

  10. #145
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    Re: Shake Shimmy STS

    I think it would be right on top of the brake fluid fill cap....2001 Deville pic...

  11. #146
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    Re: Shake Shimmy STS

    Logan, I just checked my car, and it is 44". It seems that the Deville's are more cab-forward than the Seville's though. My brake reservoir is about even with the top strut nut. As long as the reservoir is lower than the strut towers, I do not see why it wouldn't work. Let me get mine first, and I will post how things are.

    Don

  12. #147
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    Re: Shake Shimmy STS

    Hi dadillac.I just call my local dealer today .The struts brace have to special order take 3-5 days and ship from Michigan.That cost me $75Cad.

  13. #148
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    Re: Shake Shimmy STS

    Has anyone tried replacing the control arm bushings with aftermarket HD type ones? The original bushings were new for 1998 and are special in that they're designed to deflect the arm when hitting potholes, etc. to lessen the impact to the rest of the car.

  14. #149
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    Re: Shake Shimmy STS

    Quote Originally Posted by El Dobro
    Has anyone tried replacing the control arm bushings with aftermarket HD type ones? The original bushings were new for 1998 and are special in that they're designed to deflect the arm when hitting potholes, etc. to lessen the impact to the rest of the car.
    Not sure what you mean. The stock control arm bushings are made of a soft rubber? If that is the case, then that could be a possible cause. Please elaborate. Also, if this is the case, does anyone make poly bushings for the arms? Energy Suspension maybe?

    Don

  15. #150
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    Re: Shake Shimmy STS

    Here's what it says in the 1998 Seville technical manual. "The control arms' front pivot bushings are rubber-hydraulic designs, which permit the use of a very low fore-and-aft rate without incurring undesireable vibrations. The soft rate in this direction permits the front wheel to move slightly rearward over bumps to minimize impact harshness. By aligning the control arms' rear pivot bushings with the front wheel centerline, they can be tuned more firmly to resist lateral forces, thereby providing sharp steering response. The front suspension's compression travel is 7 percent greater than the 1997 Seville".

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