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Thread: Rattling front brake discs

  1. #1
    apriliaforum prov-nov
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    Rattling front brake discs

    Hi all,

    After all of the issues were sorted out it was time to take my Capo for a real ride.
    I've been touring Scotland for over 2 weeks putting 2.7k miles on the clock on the new-to-me Capo.

    Bike performed very well.
    Yes, it is a bit top heavy and getting it about to the wild camp site was sometimes sketchy. Panniers are OK, but the top loaded would be better access wise and could do for a nice table.
    But that's just details/personal preference.

    The thing that I really did not like were the rattling brake discs.
    They drove me mad on the pot holes filled roads in rural Scotland - they sounded like I had two buckets full of spanners attached to the front end of the bike...

    Grant said that this is normal with those bikes when he loaded the new engine map for me.
    Fair enough, but...

    IS THERE ANYTHING THAT CAN BE DONE TO STOP THEM RATTLING???

    Any advice is much appreciated, I love the bike otherwise...


    K.

  2. #2
    apriliaforum expert
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    Yep, take the washers off and rebend them
    I'd rather have a full bottle in front of me than a full frontal lobotomy

  3. #3
    apriliaforum prov-nov
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    Hi,

    Thanks for the quick answer.

    Could you please share more detail on what do you mean?
    Any instructions? What should be the torque on the bolts when put back together?

    K.

  4. #4
    apriliaforum Member skvrnsk's Avatar
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    Just bend these springy washers some more or buy new one or You could even double them, as I did with my back disc.

    25Nm for the front brake discs.

  5. #5
    apriliaforum prov-nov
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    Hi again,

    I just tried to contact Grant to fit new washers on my discs.
    Unfortunately, they cannot get them of their supplier.

    Does anyone know where I can buy them?
    I don't want to buy the whole discs/washers set as it doesn't make sense to spend over 300 to replace something that isn't broken...

    Thanks.

  6. #6
    apriliaforum expert brmbrm's Avatar
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    skvrnsk is correct as most people bend the wavy washers some more.
    Should last until re-bending at 12 monthly intervals.
    Also rotate the bolt spacers before tightening the bolts.So that an unworn edge bears against the slots in the disc.
    There is another stage that involves making special parts, but try the above.
    My name is Dave,
    bike's name is Black Betty.

    When you're traveling, you are what you are right there and then.


    Caponord - Douglas Dragonfly - 1942 Harley back again
    Pegaso - Matchless G3LS - BSA A7SS - 1942 Harley - Matchless G80/600cc - Matchless G3LS - BSA C15 - Velocette

  7. #7
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Use the older model non floating disks. Simple swap, works perfect.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    9900 IH35N
    Austin, TX 78753
    micah@af1racing.com
    @ShoemakerMicah
    @AF1Racingaustin

  8. #8
    apriliaforum prov-nov
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    Thanks for the advice.

    I wouldn't know how far to bend them.
    I do not have a torque wrench.
    It's brakes, I wouldn't like to mess about with them myself.

    Is it the part no. 20 on this diagram?
    http://www.apriliagenuineparts.co.uk...-wheel-934.php

    Do I need anything else?


    Thanks.

    K.

  9. #9
    apriliaforum expert
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    Hi
    I wouldn't know how far to bend them. - Until they have a slight curve again - Think of those springy washers you buy at Halford to give you an idea
    I do not have a torque wrench. Suggest you invest as it always comes in handy or ask a mate who has one if you don't want to use a garage
    It's brakes, I wouldn't like to mess about with them myself. - If unsure Take the loose wheel to your mechanic, he should be able to sort it at a cost. Or you could give it a go. As long as you put it back together how it came apart is should be quite straight forward. It's a rewarding experience when you spanner your own bike.

    Is it the part no. 20 on this diagram? Yes that's the item
    I'd rather have a full bottle in front of me than a full frontal lobotomy

  10. #10
    apriliaforum expert
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    It could be 21 Krystian - The schematic is low res so can't see it clearly
    I'd rather have a full bottle in front of me than a full frontal lobotomy

  11. #11
    apriliaforum expert brmbrm's Avatar
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    How far to bend them?
    It's not critical, they are very light wavy washers, designed for use to control end float with bearings for light weight equipment.
    The spacers control how much they are compressed.
    The tightening torque is to ensure that the disc bolts don't fall out, and don't overload the aluminium hub tappings that they screw into. No effect on the compression of the wavy washers.
    Don't know who thought of this idea, but they should have used disc springs and designed the spacers to suit which is what I have done. But needs special spacers to be manufactured. Accurate and careful work required.
    So bend the washers without breaking them. Rotate the spacers so the unworn edge aligns with the disc slots.
    There are some pretty lightly tightened screws on the Capo which will strip threads if overloaded. You need a torque wrench.

    As you say, they are brakes. A polished pad rubbing against stainless steel, and then rubber onto the road surface
    Last edited by brmbrm; 07-03-2018 at 08:55 AM.
    My name is Dave,
    bike's name is Black Betty.

    When you're traveling, you are what you are right there and then.


    Caponord - Douglas Dragonfly - 1942 Harley back again
    Pegaso - Matchless G3LS - BSA A7SS - 1942 Harley - Matchless G80/600cc - Matchless G3LS - BSA C15 - Velocette

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