Author [NL] [FR] [ES] [DE] [SE] [IT] front brake disc  (Read 2357 times)

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  • Offline ianmason

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    Offline ianmason

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    front brake disc
    on: May 20, 2020, 06.08 pm
    May 20, 2020, 06.08 pm
    Hello,
    i am looking for a set of front brake discs as mine are slightly warped

  • Offline Coconut   gb

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    Offline Coconut

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    Re: front brake disc
    Reply #1 on: May 20, 2020, 07.19 pm
    May 20, 2020, 07.19 pm
    Make sure they really ARE "slightly warped".

    Ensure the "Bobbins" are free to move ( Plenty of forum Topics about cleaning them ),
    and then try a few firm front brake applications in a straight line,
    which may centralise the semi-floating discs, and reduce or even remove the
    slight vibration / pulsing that is often associated with warped discs, when they might not be !

    Cheers  :821:



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    Re: front brake disc
    Reply #2 on: May 20, 2020, 10.00 pm
    May 20, 2020, 10.00 pm
    The square type easyout in a cordless drill rotating in reverse with a can of brake cleaner and the small tube attached works wonders when sprayed in the gaps while rotating them and is the quickest way to clean the bobbins.
    One of the Founding Members of the Twisted Trophies

  • Offline ianmason

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    Offline ianmason

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    Re: front brake disc
    Reply #3 on: May 21, 2020, 03.03 pm
    May 21, 2020, 03.03 pm
    When i picked up the bike this morning i relayed the info you had given me about the bobbins to the dealer. That went down as aswell as a F@@t in a diving suit.

    He pretty much didnt agree with what had been said and told me to get a new front disc!!

    Not sure i will be going there again

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    Re: front brake disc
    Reply #4 on: May 21, 2020, 03.17 pm
    May 21, 2020, 03.17 pm
    Try it first, and if it works, take the bike back there and have him ride it and see if he tells you it still need a new discs.  I think you'll be surprised at how much gunk gets flushed out of them. :028:
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  • Offline Coconut   gb

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    Offline Coconut

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    Re: front brake disc
    Reply #5 on: May 21, 2020, 03.28 pm
    May 21, 2020, 03.28 pm
    Did the Dealer really say to get "a" new Disc ?

    The Service Manual ( Page 15.19 ) states :

    ! WARNING
    Do not renew front brake discs individually.
    Discs must always be renewed in pairs even if one of a pair is serviceable.
    A dangerous riding condition leading to an accident could result if this warning is ignored.

    Of course it "could" be that one or both of your Discs are slightly warped,
    and if one or both of them are, then without question the pair of Discs should be replaced,
    but trying the suggested cleaning and freeing of the Bobbins first
    costs hardly anything - just a few squirts of Brake Cleaner. 

    If you can't move the Bobbins by hand this is definitely worth a try.

    If you do have to replace the Discs :

    "World of Triumph" has the Discs ( T2025056 ) priced at £218.40 EACH.

    There are also 5 securing Bolts ( T2020609 ) per Disc at £8.05 EACH that should be replaced.

    That's £436.80 for the new Discs, and another £80.50 for the 10 bolts, Grand Total £517.30.

    ( Prices should be slightly less if purchased directly from a Dealer ).

    Your helpful Dealer with then want another chunk of cash from you to fit them !

    Cheers  :821:


  • Offline ianmason

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    Re: front brake disc
    Reply #6 on: May 21, 2020, 06.14 pm
    May 21, 2020, 06.14 pm
    hello gents,
                      please excuse my ignorance but what are the bobbins? I have completely stripped the callipers and given them a damn good clean before re-assemble.

    I rode the bike for a good hour today and i cant feel anything wrong with them but maybe a i just not good enough to interpret the feedback from the brakes

  • Offline Coconut   gb

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    Re: front brake disc
    Reply #7 on: May 21, 2020, 06.28 pm
    May 21, 2020, 06.28 pm
    If you use the "SEARCH" Button - up there - top left on the Main Menu Bar,
    and type in "Bobbins" you will find plenty of information about them.

    They are the parts holding the two sections of "Semi Floating" Disc together,
    designed to allow some expansion and contraction due to heat,
    with the aim of preventing the Discs from warping.



    The theory behind cleaning them, is that if they seize up with brake dust and other "Crud"
    they might do so with the Disc held out of true, giving the impression of a warped disc
    when it isn't warped, just unable to centralise.  That's the theory anyway !

    Here's a Link to one of the many Topics :

    Front Brakes Pulsing.


    Cheers  :821:


    Last Edit: May 21, 2020, 06.33 pm by Coconut

     



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