Front end scraping sound

Discussion in 'Steering, brakes & Suspension' started by BrissyGeorge, Feb 17, 2018.

  1. BrissyGeorge

    BrissyGeorge Active Member

    Messages:
    243
    Location:
    Brisbane
    Hi,

    Today I heard/noticed a rotational scraping sound from the front end - speed related and maybe one scrape per wheel revolution.

    I focussed it down to the front left as the speedo flicks in time with the scrape - esp at low speed. The sound is quite loud at walking pace but eventually disappears as the speed builds.

    So...my question is before; I pull the front wheel, what should I be targeting - wheel bearing of should I focus on the speedo connection - or something else.

    All suggestions gratefully accepted.

    Thanks

    George
     
  2. galp

    galp Member

    Messages:
    58
    Location:
    ulverstone
    Is it disc or drum brake front end?
     
    Last edited: Feb 17, 2018
  3. splitbus

    splitbus Well-Known Member

    Messages:
    3,260
    Location:
    Brisbane
    Speedo cable hole wearing round

    Or cable frayed
     
    Last edited: Feb 17, 2018
  4. Wayne murray

    Wayne murray Well-Known Member

    Messages:
    1,572
    Location:
    Seven hills
    You mentioned wheel bearings and speedo cable. Also could be piston inside one caliper not coming back off after you have braked. You could try pushing the piston back in and then put foot on brake and push the piston out and in a few times,as the piston might be sticking in one place. If this doesn't work and it is the calipers at fault,it is a sign they need rebuilding and having replacement seals are needed.
     
  5. BrissyGeorge

    BrissyGeorge Active Member

    Messages:
    243
    Location:
    Brisbane
    disk
     
  6. cbus

    cbus Well-Known Member

    Messages:
    10,666
    Location:
    sunshine coast
    Is it noisier or constant when brake applied?
    Bearing is a rumble.
    Cable is as described.
    Metal to metal esp when applied, worn brake pad
     
  7. Resol

    Resol Active Member

    Messages:
    1,365
    Location:
    Gold Coast
    Sounds like a warped disc rotar. (Mine does this til the brakes warm up)
     
  8. galp

    galp Member

    Messages:
    58
    Location:
    ulverstone
    Take the wheel off and turn the hub by hand after checking disc pad wear spinning in both directions
    could be a pebble caught between pad and rotor or backing plate?
     
    StevieVW likes this.
  9. Weekender

    Weekender Well-Known Member

    Messages:
    458
    Location:
    Ashgrove
    While brake advice above sounds likely, it could also be a wheel bearing. If you have been in any water crossings water can enter via the speedo drive on the left hub. Remember reverse thread on left wheel bearing lock nut
     
    David H likes this.
  10. BrissyGeorge

    BrissyGeorge Active Member

    Messages:
    243
    Location:
    Brisbane
    Thanks everyone for the suggestions.

    Armed with this knowledge I took off the wheel -
    • speedo end firmly fitted to the dust cover/grease cup with a fixing washer - hole square.
    • took off the dust cover - everything tight, no movement in the bearings.
    • spun the brake disk - no warping - brake pads touching the disc at all times
    • removed the brake pads - lots of meat on both - pistons both retracted using a pair of multigrips.
    • spun the disc with no pads - it turned freely with no rumble etc from the bearings.
    • Put it back together.
    The only thing I found was the brake pad retaining pins weren`t fully home by about 5mm so I pushed them in firmly.
    After a test drive today - no sound - :) - although there was still a small flicker in the speedo needle but not quite as bad as before.

    So all in all, a bit of a mystery. Maybe it just wanted a bit of lurv.
     
    David H and Wayne murray like this.
  11. Alpal

    Alpal Moderator Staff Member

    Messages:
    8,250
    Location:
    Melbourne Bend of Islands
    In future just jack the wheel and give it a spin to see where the action is. Once you disembowel the beast hard to work out where the offence is.
     
  12. cbus

    cbus Well-Known Member

    Messages:
    10,666
    Location:
    sunshine coast
    If trying to find source?

    As Al said for starters. ;)
     
  13. BrissyGeorge

    BrissyGeorge Active Member

    Messages:
    243
    Location:
    Brisbane
    Thanks Alpal & cbus - I actually did this (but forgot to mention it) - no noise. - frustrating!!!
     
  14. cbus

    cbus Well-Known Member

    Messages:
    10,666
    Location:
    sunshine coast
    At least its gone.
    Although finding source is useful for a few reasons including eliminating something needing attention , which the check of all parts copies, plus a quick reference next time it exhibits.

    From memory... Pins may? affect how pads sit if not fully in.

    Assume noise was while in straight ahead position?
    Can be slight offset in turns.

    Pads touching when observed?
    They should pull back very slightly.
    Staying in contact is usualy a function of old seals and usualy shows first on worn pads.
     

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