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Thread: Replacing thrust arms vs. thrust arm bushings

  1. #1
    Join Date
    Aug 2004
    Location
    Milwaukee, WI; Chicago, IL
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    361

    Default Replacing thrust arms vs. thrust arm bushings

    OK so which way do you think I should go?

    My 535i has got ~125k miles on it and I get a bad shudder at 55mph under braking.

    I plan on replacing rotors and pads all around later on this year and would like to concentrate on freshening up the suspension.

    So as far as thrust arms go, would it be easier/better to replace the entire assembly or just change bushings? In the Bentley it says I need a special tool to replace thrust arm bushings, which makes me think it may not be worth all the extra effort just to replace bushings.

    Do thrust arms "give out?" Any improved thrust arms/other suspension components I could replace that would make a substantial improvement to my ride?
    1990 BMW 535i 5 speed - Black on Grey, LSD

  2. #2
    Join Date
    Feb 2004
    Location
    Philippines
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    474

    Default

    Replace the whole arm w/ bushings. Cost isn't that much more, and yes, the ball joints on the arms give after some time and cause some clunking in the front end.

    Other stuff to look at replacing, tie-rods, links, idler arm, shocks.

  3. #3
    Join Date
    Feb 2004
    Posts
    34

    Default thrustarms

    The consensus on the board is usually to replace the whole arm and use the ones that have the 750il bushings pressed in.

    Al
    91 535iA

  4. #4
    Join Date
    Feb 2004
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    Bellingham
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    380

    Default

    Seeing as how you have to remove the arms anyways, ya might as well just put new ones on.

  5. #5
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    Feb 2004
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    4,892

    Default

    Replace whole arm with 750il bushing... yes, the ball joint on the thrust arm is a concern at 125K.

  6. #6
    Join Date
    Aug 2004
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    Milwaukee, WI; Chicago, IL
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    Default

    Can I pick up a thrust arm with 750il bushing compatible to the E34 OEM?

    Is it really an OEM 535i thrust arm with 750il bushing pressed in aftermarket?
    1990 BMW 535i 5 speed - Black on Grey, LSD

  7. #7
    Join Date
    Jun 2004
    Location
    Bay Area, CA
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    Default

    www.bmaautoparts.com call and ask for patrick of yves. they sell pre-pressed 750il bushings with the correct thrust arm for 99~lemforder.

    www.KaRealtySF.com
    Build Date: 05-1995 /Engine: m50tu /Automatic Transmission /ABS /NO ASC /Open Differential /EAT Chip

  8. #8
    Join Date
    Oct 2004
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    3,395

    Default

    You may want to consider the M5 bushing over the 750i ones. The M5 is an even more robust design than the 750. The differences were recently discussed on UUC and may presently be in the archives on the web site.

    Actually just pressing in a new bushing is much cheaper than replacing the entire arm FWIR, but at 125+k, the ball joint is probably heading south anyway.

    Now: your 55mph shimmy could be warped rotors, which is not something I, personally, would leave until later on this year. If they're warped after normal/non track driving conditions, then they're probably well worn and in need of attention.

    best, whit
    Last edited by Kalevera; 05-07-2005 at 10:20 PM.

  9. #9
    Join Date
    Aug 2004
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    Milwaukee, WI; Chicago, IL
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    Default

    I'd rather pick up parts from the stealer.

    Any OEM recommendations/thrust arm upgrades welcome.
    1990 BMW 535i 5 speed - Black on Grey, LSD

  10. #10
    Join Date
    Aug 2004
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    Milwaukee, WI; Chicago, IL
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    Default

    Quote Originally Posted by lowell
    Now: your 55mph shimmy could be warped rotors, which is not something I, personally, would leave until later on this year. If they're warped after normal/non track driving conditions, then they're probably well worn and in need of attention.
    Whit you're right, I think the shimmy is a combination of both thrust arms and rotors... I have some pretty crappy rotors on right now (X drilled from the PO) with their old pads, but they've still got some life left and I rarely get up to 55 at any driving event (auto X)... I'd like to get my suspension refreshened a little and I have a bike that needs maintenance so until the pads give out my rotors will stay in.
    1990 BMW 535i 5 speed - Black on Grey, LSD

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