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Knocking from front o/s wheel

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by amimmortal, Apr 6, 2013.

  1. amimmortal
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    amimmortal Member

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    [Apr 6, 2013]
    Hi all,

    We've just returned from a 400 mile round trip to the in-laws with no problems to report. Then, this morning, on a drive up to Perth, I became aware of a noticeable knocking sound coming from the o/s front wheel (I think).

    It was most obvious at about 55mph, but could be heard clearly up to and beyond 70mph - it was noisiest when going downhill and disappeared completely when I braked. It didn't seem to make any difference if I was steering left or right at the time. It doesn't seem to be making any noise at lower speeds.

    I recently had the front discs and pads changed, and the front o/s calliper was also replaced as the old one had seized, apparently.

    The car's just turned over 69,000 miles. The o/s CV boot kit was fitted at 44,000 miles, and the n/s was done at 47,000 miles. Additionally, the n/s front lower ball joint was replaced at 51,000 miles.

    Any tips welcome!

    Cheers,

    A.
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  3. @udi A3
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    @udi A3 Site Sponsor Site Sponsor VCDS Map User

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    [Apr 6, 2013]
    I was about to post a thread but i have some similarities on my a3.
    i think the noise started when i swapped tyres front to back. A whoomp whoomp whoomp rotational noise from driver side wheel when doing about 30-70 mph round sweeping left bends. Not wheel bearing.
    Today i eventually finished upgrading to 312 discs n pads, the whoomp noise has gone but after about 30mph i hear a noise like something scraping at a point of the rotation. The noise changes when pressing brakes.

    Due to this i think it could be a calliper related issue. My passenger calliper looked in better condition than driver side.

    I can't understand the issue though , why would a calliper cause this noise.
    #2
  4. amimmortal
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    amimmortal Member

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    [Apr 11, 2013]
    Hi all,

    Turns out the new disc is rubbing against the metal guard plate. Not sure why - could be that the discs fitted were too thick. Either way, nothing too serious.

    Garage has pledged to get it sorted for me either way.

    Cheers!

    A.
    #3
  5. TwistedMind
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    TwistedMind Long Live The A6

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    [Apr 12, 2013]
    Metal guard plates are made from tin foil ! LOL very bendy !
    #4
  6. TYphoon GB
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    TYphoon GB Member

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    [Apr 16, 2013]
    Low speed Knocking......front and rear lower control arms.... and then the upper ones.

    Lower ball joints not easy.....upper pinch bolts right cow...

    Then the engine mounts?
    #5
  7. amimmortal
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    amimmortal Member

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    [Apr 19, 2013]
    Hi all,

    Car now back and all noise gone. The guard just needed adjusting so hopefully that's the last of that...

    A.
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