1999 E38 728....Brake shudder

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  1. 1999 E38 728....Brake shudder 
    #1
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    e38rulez's Car Details
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    Hi all,

    Even after I've had my wheels balanced and the 45-55mph wheel wobble vanishing, there's still a shudder when I brake which is very unpleasant. I replaced the upper control (thrust) arm bushes 3 years ago which completely sorted the problem out. Would these bushes wear out that quickly (after 25000 miles)??? Or could it be warped brake discs?

    Thanks
    Last edited by Martyn D.; 03-12-2011 at 20:57. Reason: title...etc
     
     

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    Jack each of the front wheels up and take each wheel and shake it vertically, then horizontally, i.e. North & South, then East and West. If there is any movement at all, then one of your front bushes is worn or the wheel bearing has gone. Easy to see if it is a bush or a wheel bearing if you get someone to shake the wheels for you. I have had this a few times.

    I would also check whether the brake discs are ok but in my experience, I have never had a warped brake disc in 35 years of driving, but I may just be lucky.
     
     

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    rear bushes or warped discs on the bigger engined cars...
    330i sport a big chunk of berlin...

     
     

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    GL0D's Car Details
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    Depends what speed you notice the shudder. If at slow speeds it's not there then I'd say it's not warped discs, ... plus you'd feel it through your brake pedal a bit more.

    If you get it more at higher speeds then I'd go with wheel alignment/tracking or worn tie rod ends.
    (Them silly square speed bumps always tend to push the wheels to toe out - Mine shudders every 4-6 months cos I've got stiff suspension)
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    Wrong title...wrong section...please have a read through here.
    http://www.bimmerforums.co.uk/forum/...ard-to-t22490/
     
     

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    What quality were the replacement bushes?

    The 7 is a heavy car (even with the 2.8 engine) and could easily wear out a set of cheap aftermarket bushes within that sort of timescale/mileage.
     
     

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    I know they were aftermarkets for sure, it may be, as previous posters have said simply due to the weight of the front end of this car, which is substantial, it may have worn them out now....

    The tie rod thing is also a possible and definitely worth checking...
    Thanks very much guys, you've given me a few leads to chase down.
     
     

  10. E38 Judder update 
    #8
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    Hi
    An update: Took the motor to my service centre, they checked the suspension components, wheel bearings, etc partly by shaking the wheels as the previous poster had suggested. The problem turned out to be a worn out drag link (a part of the tie rod assembly that steers the passenger side wheel). Every time the wheels were turned this link component would knock which is how they zeroed in on it as it shouldn't do this. After replacing this the front end judder has disappeared.
    There is still just an ever so so slight wobble still when I brake at the 45-50mph range and I'm convinced that this is because the thrust arm bushings are on their way out so I am going to replace these in the new year at some point also.
    Another previous poster suggested that aftermarkets won't last long, and sure enough after speaking with another BMW independent they confirmed that if you get a rubbish quality set you're lucky to have them last a year, let alone up to three years which mine has been now. My service centre guy concurs with this prognosis.
    I'm glad though that 95% of the problem has gone, the steering is much more taut now as well, wheel tracking has been re-done and the car tracks great now.
     
     

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    GL0D (23-02-2012)

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