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Front end knocking.

Discussion in 'Suspension, Steering & Brakes' started by onefortheroad, Dec 6, 2018 at 3:44 PM.

  1. onefortheroad

    onefortheroad Senior Member

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    Up to date I've changed every front arm and ball joints in the hub, plus arb link arms .both front shocks and top mounts my knock still exists over small repeated bumps on uneven roads. It doesn't make a sound over speed bumps or bumps at speed. Which kinda tells me it may not be the arb bushes,Has anyone had issues with the top horse shoe shaped mounts and the end ball joint , can you remember the metallic rattle and what did you change to cure this. Thanks.

    2008 CLS w219.
     
  2. gassed up

    gassed up Member

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    Your Mercedes:
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    I had a metallic rattle from the suspension on my C209 which had me stumped for about 3 years. Only found the cause when I stripped the rear suspension for a rebuild, transpired that the last 50mm of one of the springs had snapped off and was rattling in the spring pan. It couldn't be seen until the lower wishbone was removed.
     
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  3. Botus

    Botus Senior Member

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    what about the actual bushes holding the arm to the car? oddly true - most noises start here
     
  4. Uncle Benz

    Uncle Benz Senior Member

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    You've probably replaced them, but the balljoints that the arb drop links attach to, the ones pressed into the arm, are notoriously difficult to diagnose.
     
  5. OP
    onefortheroad

    onefortheroad Senior Member

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    I was going to detatch both arb links and drive it. If noise remains . its not them . looks like the bushes are bonded and you change the whole arb ..
     
  6. OP
    onefortheroad

    onefortheroad Senior Member

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    Changed the whole arm. But thanks.
     
  7. OP
    onefortheroad

    onefortheroad Senior Member

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    The only other thing is the strut track arm ball joints . maybe better off replacing the arms plus ball joints . if it stick knocks . its a vw tiguan on the drive !!!
     
  8. OP
    onefortheroad

    onefortheroad Senior Member

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    Today I took both arb links off and the rumble sound is still audible. So I'm ruling out the arb bushes. I've ordered both sides upper mounts and will fit those and see if things improve. Last chance saloon .
     
  9. malcolm210

    malcolm210 Senior Member

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  10. OP
    onefortheroad

    onefortheroad Senior Member

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    Unlikely , its more uneven ground that causes it. I can rev the engine and its fine.
     
  11. OP
    onefortheroad

    onefortheroad Senior Member

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    Last edited: Dec 10, 2018 at 5:11 PM

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