Knocking front suspension. - Page 2
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Cadillac BLS Forum (Europe / South Africa) Discussion, Knocking front suspension. in Past Cadillac Vehicle Discussion; If you know you have or you have been diagnosed with a broken coil spring, then the obvious answer is ...
  1. #16
    ExRPO1 is offline Cadillac Owners Fanatic
    Automobile(s): BLSd 150hp 2009
    Join Date
    Mar 2010
    Location
    Nottinghamshire UK
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    46
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    205

    Re: Knocking front suspension.

    If you know you have or you have been diagnosed with a broken coil spring, then the obvious answer is to get them both changed.

    96,000 km equates to nearly 60,000 miles. Personally, I would now be considering replacing the struts (shock absorbers) with Bilsteins as well as the front coil springs. I would also change the top suspension mount bearings.

    There will be people reading this who will be thinking 'What! Why?' The problem is, most people never bother changing their suspension parts because foolishly, they believe they don't wear out. The fact is shocks wear out over time and at about 50 to 60 thousand miles, they will be pretty tired but the owners won't notice because the wear is gradual and they get used to it. I previously changed front and rear shocks on a Nissan I owned that had done 80,000 miles and they were absolutely worn out!

    Changing all of these items at the same time might be quite expensive, but will then probably last the remaining lifetime of the car. Ride and handling will be noticeably better and the vehicle will perform better under braking. I assure you, your car is now seven years old, you would undoubtedly notice a big improvement in overall handling.

    Don't forget, you will have to have a four wheel alignment carried out after any major suspension work carried out.

  2. #17
    ETC93 is offline Cadillac Owners Member
    Automobile(s): Eldorado ETC '93 - BLS'06
    Join Date
    Feb 2012
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    France
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    61

    Re: Knocking front suspension.

    Carrying out a 4 wheel alignment will anyway have a good payback in terms of tire wear and fuel economy !
    If everything was OK then it's only prevention, still good to do
    It would be of interest to publish the correct alignment information right here somewhere in order to get it done with them becaus not everyone has this information and perform the job correctly...
    My car has a worn out sway bar link on driver side, start to knock also so they will be replaced soon.
    About the springs, I've one question : in case of replacement (sounds mandatory if only you image what can happen if you blow a tire in the mean time..., this happened a couple years ago on a recent french car nearly in front of my door)
    How can we make sure get a better quality and not a kind of New Old Stock with the same risks than before ?

  3. #18
    ExRPO1 is offline Cadillac Owners Fanatic
    Automobile(s): BLSd 150hp 2009
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    Mar 2010
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    Nottinghamshire UK
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    46
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    205

    Re: Knocking front suspension.

    Concerning alignment information, really shouldn't be a problem for garages, even in France with good set ups. Again, even if they don't have info on the BLS, the alignment set up is likely to be the same as the Saab 9-3 equivalent diesel and that is what I'd be telling them.

    Sway bar links will again likely be Saab 9-3/Vauxhall Vectra-Opel and they are readily available.

    Coil springs, it would appear there are a few choices but I'd opt for genuine Saab 93190596 or Lesjofors 4077816 for my own car, but again, I can't stress this enough, you need to check part numbers for your own application. I've given up considering the Cadillac GM coil spring part number, especially as the car is now out of warranty anyway and all of the research I've done indicates the Saab and Lesjofors part numbers are good for my own car.

  4. #19
    ExRPO1 is offline Cadillac Owners Fanatic
    Automobile(s): BLSd 150hp 2009
    Join Date
    Mar 2010
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    Nottinghamshire UK
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    205

    Re: Knocking front suspension.

    Well a year on from my last post, I thought I'd share what I've just carried out on my own BLS.

    A few weekends back, I was carrying out some routine maintenance, front wheels off and I discovered the front offside coil was rusting and pitted in one particular area. This gave me concern because I realise this is how these cars end up snapping coil springs. So having given up long ago trying to get the correct part number coil springs, I settled with buying genuine Saab Aero diesel coil springs, 93190596. I also decided to buy new Bilstein B4 shocks because the original factory fitted Sachs units were beginning to look quite tired. I then decided I might as well go the whole hog and buy all the components to build two complete brand new struts. So throughout one week ordering the necessary parts off the internet from both Saab and Vauxhall specialist part suppliers and a very well known Irish parts supplier for drop links, everything duly arrived. With the aid of my Saab Haynes Manual and a set of coil spring compressors, I built a pair of brand new struts. Total cost (including new drop links) £360.

    I then replaced the front struts myself at home. A really straightforward job, especially as I was removing complete struts and just sticking a whole new unit back in its place. As it turned out, when I removed the old drop links, I found they were breaking apart at the swivel ends. The new heavy duty Meyle drop links are superb. End result is the car sits perfectly on the new coils and the front end ride is now much better, cornering is pretty tight now for a large heavy car. The car steers absolutely straight and true, though I did discover I had a very slight wheel wobble. Had both front wheels checked and the offside wheel was out of balance and so that has been sorted.

    I haven't bothered with a four wheel alignment because after taking much advice, I haven't altered any of the steering geometry. If I'd have changed the tie rod ends, then yes, I'd have had the alignment done.

    Really happy with all the work I've done.
    70eldo likes this.

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