1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

clonk under sudden sharp braking

Discussion in 'A3/S3 Forum (8L Chassis)' started by ALPINE, Feb 12, 2010.

  1. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    front near side. just notice clonks if i hit the anchors a bit sharpish. passes an mot a month ago. any ideas??
     
  2. Google AdSense Guest Advertisement



    to hide this advert.
  3. Lilgaz

    Lilgaz Vorsprung Dirk Kuyt

    Joined:
    Oct 16, 2008
    Messages:
    23
    Likes Received:
    0
    Just out of curiosity what was the weather like/road conditions? only I`ve had that happen on two occasions, once over a year ago, and again in the last cold snap around christmas when theres been snow/ ice on the ground. It maybe just coincedance but its the only time its happened..maybe to do with the low temperature..although its been a lot colder and not happened..maybe the abs? hope this helps :unsure:
     
  4. Y83OLK

    Y83OLK Hulk Smash!

    Joined:
    Sep 6, 2009
    Messages:
    841
    Likes Received:
    4
    Check your front wishbone bushes and ARB bushes.
     
  5. paulious

    paulious Member

    Joined:
    Jul 23, 2007
    Messages:
    61
    Likes Received:
    0
    Had the same problem with mine, turned out to be Anti-roll bar bushes and linkages, pain in the arse to replace. The cold will affect noise coming from the bushes as they are made of rubber and are harder when cold. A test you you can try is to drive through a pot hole on one side then the other to see if you get the knocking noise. Obviously don't go mental through the pothole as you can do some serious damage, you could ofcourse find one that is massive, drive through it and claim damages from the council, i know a few people who have done this!
     
  6. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    yeh i think you lot are prob right about it being a bush. Had new wheels fitted and balenced yesterday as well as a full geio set up and i still get a slight wobble at between 70 and 80. it goes away any slower or faster. Its not violent but ever so slight.(almost not there if that makes sense) Dont know if a worn ARB would cause this??
     
  7. paulious

    paulious Member

    Joined:
    Jul 23, 2007
    Messages:
    61
    Likes Received:
    0
    Hmm i'm not really mechanically minded i just dabble and try to save on stupidly expensive mechanic costs but when i had warn anti roll bar linkages and bushes i had no wheel wobble whatsoever even at the cars top speed. Next time you are under the car look for some play in the linkages, you will know if it doesn't feel right. I honestly can't see that causing the problem though unless ofcourse at 70-80 it happens to be the resonant frequency of the linkages but i'm just guessing to be honest. Do you have any play in the steering?
     
  8. Broken Byzan

    Broken Byzan Photographic Moderator
    Staff Member Moderator VCDS Map User Audi A4 quattro

    Joined:
    Apr 26, 2004
    Messages:
    13,021
    Likes Received:
    395
    Are you sure the wheels are tight ? :sorry:
     
  9. paulious

    paulious Member

    Joined:
    Jul 23, 2007
    Messages:
    61
    Likes Received:
    0
    Just a quick thought, on the wheels you took off yesterday did you notice uneven wear?
     
  10. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    lmao mark! arse!
     
  11. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2

    didnt really look but cant say i saw anything obvious. my tracking was well out tho.
     
  12. paulious

    paulious Member

    Joined:
    Jul 23, 2007
    Messages:
    61
    Likes Received:
    0
    Yeah if i were you get those anti roll bar bushes replaced and linkages if needed then see if the problem goes away. The knocking noise will just get worse and worse, it will affect handling too so i've been told.
     
  13. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    cool i will look into it, thanks
     
  14. jonny87

    jonny87 Active Member

    Joined:
    Sep 24, 2009
    Messages:
    1,098
    Likes Received:
    3
    i have a wobble at 80-90ish
    started after knocking car up a kerb :(
    put new wheels on, new tires, rebalanced the lot and had tracking done
    still pulls the left quite badly and has the aforementioned wobble

    although ive been told i have a few worn bushes etc before the little adventure up the kerb the steering was perfect, straight as anything no wobbles

    if i had bent a track rod end would they not have picked up on this when doing the tracking?

    and i havent noticed a clunk when under harsh braking but i do get a clunk when reversing off my drive and putting it on almost full lock, low speed obviously?
     
  15. djb83

    djb83 redline responsibly

    Joined:
    Sep 10, 2009
    Messages:
    68
    Likes Received:
    0
    this may sound stupid but mabbye a cv joint ? that could cause the clunk on full lock
     
  16. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    checked that fella, think it mite me a ARB worn. Ill get on the case payday! :)
     
  17. djb83

    djb83 redline responsibly

    Joined:
    Sep 10, 2009
    Messages:
    68
    Likes Received:
    0
    cool mate got the same prob i was thinking cv but i'll chek my arb's soon as
     
  18. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    :icon_thumright:
     
  19. simch

    simch Active Member

    Joined:
    Feb 22, 2004
    Messages:
    2,028
    Likes Received:
    1
    If it is like a loud twangy clonk, it is almost certainly a sheared engine / gearbox mounting bolt, on the n/s of the car, you may not even realise it as the bolts seize in the mount but also snap so dont hold the mount in lace properly. A lot of drilling out required , tap the threads and fit a new bolt.

    ARb bushes are more just a rattle over potholes and transverse ridges, not really affected by brakes. The broken bolt shows very few symtoms, only the loud single clunk under very heavy or sharp braking. Normal braking at slower speeds, all seems ok.
    BTW is it an s3 or an a3? MOre common on A3s and golf 4s.
     
    #18 simch, Feb 16, 2010
    Last edited: Feb 16, 2010
  20. djb83

    djb83 redline responsibly

    Joined:
    Sep 10, 2009
    Messages:
    68
    Likes Received:
    0
    well i have found my problem the fecking power steering rack has failed on me so thats another s3 off the road for now :blownose:
     
  21. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    this sounds more like it. thankyou, ill get it checked out. its an A3 BTW. dont suppose you got any pics of what mount it is do you?


    cheers
     
    #20 ALPINE, Feb 17, 2010
    Last edited: Feb 17, 2010
  22. Google AdSense Guest Advertisement



    to hide this advert.
  23. Broken Byzan

    Broken Byzan Photographic Moderator
    Staff Member Moderator VCDS Map User Audi A4 quattro

    Joined:
    Apr 26, 2004
    Messages:
    13,021
    Likes Received:
    395
    You are unlikely to have the broken bolt due to the engine having been changed last year anyway, we had the lot out, so corrosion and fretting is unlikely
     
  24. simch

    simch Active Member

    Joined:
    Feb 22, 2004
    Messages:
    2,028
    Likes Received:
    1
    No, mine broke after the gearbox had been taken out and put back in for a clutch job. It was a biyatch to undo, and probly weakened it, then when done back up with the impact gun, it started to make the clunk. Took a while to find it, and we ended up having to drill the gbox flange right through and fit and nut on the end of a longer bolt.

    Worth a check as the symtoms were exactly as described.
     
  25. ALPINE

    ALPINE Yes its diesel, now cry u lost

    Joined:
    Apr 8, 2008
    Messages:
    3,096
    Likes Received:
    2
    think i need to take a drive to the garage of the welshman! lol
     

Share This Page