Author [NL] [FR] [ES] [DE] [SE] [IT] Topic: Need help with a diagnosis for a front end noise when turning the bars  (Read 10656 times)

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  • Offline flyingz06

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    Offline flyingz06

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    Need help with a diagnosis for a front end noise when turning the bars
    on: Jul 31, 2016, 10.55 pm
    Jul 31, 2016, 10.55 pm
    to the right.

    So if Im in a parking lot and turn around to the right, it sounds like by disc is warped.  The noise comes and goes as the tire is rotating with no front brake pressure.  Its getting worse.   No other notice of issues with brakes or anything.

    Bike has 7500 miles with original brakes and tires.

    I can not duplicate the sound if i have it on the stand and rotate the wheel and turn the bars.   

    Thoughts?
    Last Edit: Jul 31, 2016, 10.57 pm by flyingz06

  • Offline flyingz06

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    Offline flyingz06

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    Re: Need help with a diagnosis for a front end noise when turning the
    Reply #1 on: Aug 01, 2016, 01.16 am
    Aug 01, 2016, 01.16 am
    Sound is disappears with brake on.  So I'm assuming it has to be the pads.

  • Offline Coconut   gb

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    Re: Need help with a diagnosis for a front end noise when turning the
    Reply #2 on: Aug 01, 2016, 06.19 am
    Aug 01, 2016, 06.19 am
    It could well be the pads - have you checked the disc / rotor "bobbins" are not seized up
    which allow the disc to be semi-floating ?

    Last Edit: Feb 11, 2021, 12.01 pm by Coconut

  • Offline flyingz06

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    Offline flyingz06

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    Re: Need help with a diagnosis for a front end noise when turning the
    Reply #3 on: Aug 01, 2016, 01.01 pm
    Aug 01, 2016, 01.01 pm
    *Originally Posted by Coconut [+]
    It could well be the pads - have you checked the disc / rotor "bobbins" are not seized up
    which allow the disc to be semi-floating ?



    OK im a new at some of this.  why would a frozen bobbin make that sound?  Or why are you referencing the bobbin?  How do I check them Coconut? 

  • Offline Coconut   gb

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    Re: Need help with a diagnosis for a front end noise when turning the
    Reply #4 on: Aug 01, 2016, 07.15 pm
    Aug 01, 2016, 07.15 pm
    Just use the SEARCH button up there on the Menu Bar, and enter "Bobbins".

    This post : "Front Brake Discs Warped" discusses "Bobbins",
    and has Photo's and a link to a video on how to clean them ( Posts 23 & 24 ).

    The Bobbins allow a little side to side movement of the discs ( rotors ),
    helping to keep them centralised between the brake pads.

    My thought process is that if they have seized up solid ( as they can do ),
    they may have seized slightly out of true alignment and in severe cases
    can give the impression of being warped.


    If one or both of the discs ( rotors ) are not running totally true
    as the wheel rotates part of the disc ( rotor ) could lightly make contact
    with one or more of the brake pads resulting in a noise, which might be what you can hear.

    This could be exacerbated when turning the motorcycle
    due to the additional sideways forces that are produced when turning.

    Cheers  :821:

    Last Edit: Feb 11, 2021, 12.01 pm by Coconut

  • Offline flyingz06

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    Offline flyingz06

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    Re: Need help with a diagnosis for a front end noise when turning the
    Reply #5 on: Aug 02, 2016, 01.55 am
    Aug 02, 2016, 01.55 am
    you are the king!  :020:  thank you.  I watched a few videos online and will free them up tomorrow night.  They are frozen :190:

  • Offline Coconut   gb

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    Offline Coconut

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    Re: Need help with a diagnosis for a front end noise when turning the
    Reply #6 on: Aug 02, 2016, 10.19 am
    Aug 02, 2016, 10.19 am
    Let us know if it cures the "noise".

    If they've been seized for a while, and after freeing off the bobbins
    there is any sensation if "pulsing" when the front brake is applied,
    it would be worth checking for any excess run-out,
    ( Maximum allowable run out is 0.15mm ),
    which would indicate if the discs / rotors have warped.

    Cheers,

    Last Edit: Feb 11, 2021, 12.00 pm by Coconut

  • Offline 1150newguy

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    Re: Need help with a diagnosis for a front end noise when turning the
    Reply #7 on: Aug 02, 2016, 11.36 pm
    Aug 02, 2016, 11.36 pm
    I haven't suffered any brake issues, but after reading about problems some have had I decided to do a "bobbin check" on my 2014 Trophy. After 40,000 miles mine were free enough that they would turn with a wrench while I was tightening the bolt. I went ahead and gave them a spin with the drill along with a shot of brake cleaner. While I was doing this I was thinking about what would cause some to have seized bobbins and others to have no issues. I am sure environment plays a big role. Here in southern Ohio we don't deal with salt air and we have less rainfall than many areas. We do get some high humidity from time to time. I tend to use my front brakes pretty aggressively at times, could that help keep the bobbins free? Who knows? Just thinking out loud here.

     



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