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Anyone fancy a research project? (Brake pads and retainer pin)

  1. #1
    Senior Member dhawks's Avatar
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    Anyone fancy a research project? (Brake pads and retainer pin)

    At some point during my final event of the season, I came back to the paddock without rear brake pads or retainer pin -- just a rear caliper in its normal place. Because the bike is relatively new to me, I hadn't spent any time with the rear caliper, so I don't really know exactly what is missing.

    What I know:
    --It's a 2-piston (piston is 34mm in outside diameter) Brembo rear racing caliper, stamped "8K23" on the caliper housing, and mounts under the rotor with a bracket that allows Japanese bikes to use this caliper. (see photos)
    --I use it on a 2009 Yamaha R6.
    --However, this particular R6 uses a lot of 2009 Yamaha R1 parts, including for example an R1 front end.

    What I think I know:
    --Seems like it's an old Brembo model "P2 34".
    --None of the photos I can find online suggest that there were any clips or springs -- just pads on a pin, which seems odd to me.
    --Seems like these pads would work with this caliper:

    https://motowheels.com/i-23901450-br...rake-pads.htmlhttps://motowheels.com/i-23901450-brembo-rear-caliper-brake-pads.html[/URL]
    https://www.kurveygirl.com/shop/prod...roducts_id=720

    What I can't figure out:
    --What pin do I need to retain the pads in the caliper? Is it even available?
    --Were there springs in the caliper?
    --Keep running into conflicting information and part numbers, etc.

    Anyone have experience with this caliper or any suggestions?

    Thanks.

    Anyone fancy a research project?  (Brake pads and retainer pin)-img_1328-jpgAnyone fancy a research project?  (Brake pads and retainer pin)-img_1329-jpgAnyone fancy a research project?  (Brake pads and retainer pin)-img_1330-jpgAnyone fancy a research project?  (Brake pads and retainer pin)-img_1331-jpg

    0 Not allowed! Not allowed!
    /s/ Dustin
    LRRS #767
    '09 R6 / '11 848 Evo / '99 RS250

  2. #2
    High maintenance priss
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    Re: Anyone fancy a research project? (Brake pads and retainer pin)

    Hey Dustin - Looks like the part number for the pin (Brembo calls it a spindle) is 120A44170. No mention of a spring. Some of the other rear calipers do have a spring part number, so looks like yours may not have had one.

    Brembo Racing Catalog - See page 33.

    GL

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  3. #3
    Senior Member dhawks's Avatar
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    Re: Anyone fancy a research project? (Brake pads and retainer pin)

    Kian -- A belated 'thanks' -- eight flipping' months later!

    I was able to purchase the pads and spindle. But when I went to spread the pistons to insert the new pads, one piston moved and leaked; the other didn't move at all. Normally this would indicate that a caliper rebuild could be in order, but I simply cannot find any information on the seals/pistons that would form the rebuild kit for this caliper. Intuitively, I know I have 34mm pistons, so part of me thinks I should just buy some amorphous Brembo 34mm piston and seal kit. However, part of me wonders why there isn't any evidence of a rebuild kit for this caliper. Like, anywhere. And the racer, track rider, responsible, survival-instinct-having part of me, of course, whispers "there shall be no guesswork with braking systems, even rear braking systems, you idiot."

    0 Not allowed! Not allowed!
    /s/ Dustin
    LRRS #767
    '09 R6 / '11 848 Evo / '99 RS250

  4. #4
    Soul Rider Paul_E_D's Avatar
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    Re: Anyone fancy a research project? (Brake pads and retainer pin)

    I would just put a stocker back on...

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    Paul_E_D


  5. #5
    Lifer nt650hawk's Avatar
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    Re: Anyone fancy a research project? (Brake pads and retainer pin)


    1 Not allowed! Not allowed!
    Last edited by nt650hawk; 05-28-20 at 08:12 PM.
    Gino
    HAWK GT Racer Expert #929
    2012 CCS LRRS ULSB Champion
    2012 CCS LRRS P89 Champion
    2008 CCS ULSB National Champion
    ECKRACING Bridgestone Street & Competition Woodcraft MOTUL On Track Media Pine Motorparts Vanson Leathers

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