Author [NL] [FR] [ES] [DE] [SE] [IT] Pulsating front end when stopping  (Read 1917 times)

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  • Offline JerseyJeff

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    Offline JerseyJeff

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    Pulsating front end when stopping
    on: Sep 02, 2020, 05.07 am
    Sep 02, 2020, 05.07 am
    Has anyone had problems with warped rotors ?
    I have about 35K on my TTSE, and i'm getting some wicked pulsating when stopping using the front brake. It disappears as soon as I let off the hand lever.
    Also looking for recommendations for replacements, if anyone has done that and found a good source.

    Thanks in advance, J.J. :157: :087:

  • Offline Coconut   gb

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    Offline Coconut

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    Re: Pulsating front end when stopping
    Reply #1 on: Sep 02, 2020, 09.34 am
    Sep 02, 2020, 09.34 am
    Have a play with the SEARCH Button and look for "bobbins" !

    There are a number of Topics - this one runs to 25 pages ! :

    Front Brake Discs Warped

    The front discs are "Semi-Floating", to allow for expansion and contraction.

    If the bobbins seize up with brake dust / crud, there is a possibility of the discs
    sticking in a slightly out of true position, and may exhibit characteristics
    that can make the rider think the Discs are warped, when in fact they aren't.

    Follow the advice in other Topics to clean the bobbins if they cannot easily be rotated,
    using proprietary brake cleaner, then find a clear straight stretch of road to carry out a few
    reasonably heavy front brake applications.

    If the problem was the Discs being seized on the Bobbins and held slightly out of true,
    then the heavy braking should centralise them again.

    Of course the Discs could be warped - but the above process is a much cheaper method
    to try first, rather than buying new Discs ( and Pads ! ).

    It is not easy to check whether the Discs are actually warped - if they are measured
    with a Dial Test Indicator fixed to the Caliper and the wheel is rotated when the Disc is NOT running "true"
    then the DTI Readings will make it look as though the Disc is warped, when it might not be !

    Even removing the Disc from the wheel and trying to check for warping isn't easy as the bobbins
    stand proud and prevent the Disc from lying down completely onto a Flat Plate for checking.  :087:

    In addition to cleaning the Bobbins, it is good practice to regularly check and ensure that
    all of the Brake Pads move easily in their carrriers, and that none of the Caliper pistons are seized.

    NOTE : You should also check the front tire for wear / scalloping, and wear in the front wheel bearings,
    which can both result in symptoms similar to those you describe.

    Hope this helps !  :028:

    Last Edit: Sep 02, 2020, 09.38 am by Coconut

  • Offline Saddle Tramp   us

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    Offline Saddle Tramp

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    Re: Pulsating front end when stopping
    Reply #2 on: Sep 02, 2020, 03.28 pm
    Sep 02, 2020, 03.28 pm
    There's not much that I can add to Coconut's excellent detailed response (as usual), but I can add my personal experience.
    I have never owned a motorcycle that required bobbins maintenance, but I can tell you that on my Trophy, it works.
    It seems to be needed more frequently than at the regular 10k mile service, but every time my front brakes begin pulsing, I perform the bobbins maintenance, I'm good to go for another several thousand miles...  :016:

  • Online trophied   us

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    Re: Pulsating front end when stopping
    Reply #3 on: Sep 02, 2020, 08.32 pm
    Sep 02, 2020, 08.32 pm
    Agreed.  Regular routine.
    One of the Founding Members of the Twisted Trophies

  • Offline Jeffb   us

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    Offline Jeffb

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    Re: Pulsating front end when stopping
    Reply #4 on: Sep 02, 2020, 08.42 pm
    Sep 02, 2020, 08.42 pm
    Try the bobbins first, but some people haven't had satisfactory results. EBC makes replacement rotors. When people have had to resort to new rotors, I don't think many have had good results with oem replacements.

  • Offline JerseyJeff

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    Offline JerseyJeff

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    Re: Pulsating front end when stopping
    Reply #5 on: Sep 05, 2020, 12.43 pm
    Sep 05, 2020, 12.43 pm
    Thanks to all for the replies. Gonna try to clean up the bobbins, and let you know if it worked. Rotors are about $500 just to purchase. :005:

  • Offline MidnightSE

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    Offline MidnightSE

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    Re: Pulsating front end when stopping
    Reply #6 on: Sep 05, 2020, 11.50 pm
    Sep 05, 2020, 11.50 pm
    TTSE is the first-ever motorbike I had to do bobbins spin.
    Although I've known about the bobbins spin procedure before and entertained meself with it.
    It didn't work for me as rotors were too far gone.
    EBC rotors and pads cured the issue. But EBC brakes are inherently noisier.
    I am OK with it.
    On the plus side, the gold accent of EBC XC rotors accentuates the black livery of my TTSE.

    Cheers...
    Last Edit: Sep 05, 2020, 11.52 pm by MidnightSE