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Brake rotor/disc loose on the pins

  • ralphski
    ralphski
    5 years ago
    put a new rear tyre on at Hobart while doing our ride around Tassie.
    the tech says " you need to come and look at this " i thought WTF, not here.
    the rear floating rotor ( CVO Springer '08 ) was loose on the pins.
    they didn't have one to put on ( $ 315 ) so i left it and managed to get home without using my rear brake at all.
    this had it's own issues as the roads in Tassie on our trip maybe 30 % wet/damp.
    coming down into Queenstown, WET road and NO rear brake, FFS.
    Anyway, is there a fix that you can do to re-pin the rotor ?
    Or, just buy a new one ?
    thanks boys

  • paulybronco
    paulybronco
    5 years ago
    Sorry Ralph there has to be "play" between the disc and carrier hence the term "floating disc". You should be able to have some play between the two.....am i not understanding your problem?
  • ralphski
    ralphski
    5 years ago
    understand the floating disc requirements PB
    the issue is that when you grab the rotor, it rocks back and forth with the knocking noise, maybe a 1mm on the pins.
    it should have no movement back and forth, still be firm on the pins but allow it to move sideways when the pads contact the rotor. 
    it looks like the pins have stretched/de-formed visually, compared to the front.
    i'll take some measurements later.
  • paulybronco
    paulybronco
    5 years ago
    Quoting ralphski on 22 Feb 2019 12:16 AMedited: 22 Feb 2019 12:23 AM

    understand the floating disc requirements PB

    the issue is that when you grab the rotor, it rocks back and forth with the knocking noise, maybe a 1mm on the pins.
    it should have no movement back and forth, still be firm on the pins but allow it to move sideways when the pads contact the rotor. 
    it looks like the pins have stretched/de-formed visually, compared to the front.
    i'll take some measurements later.

    Ralph i would not worry too much unless the pins have worn either the disc or the carrier into a funny shape. I had a race bike with big floating discs and if you held the brake on at rest and moved the bike back and forth you could feel the freeplay (and knocking noise) . A good machine shop should be able to spin you up some marginally larger pins to stop the excessive play
  • leachy
    leachy
    5 years ago
    Hi Ralphski,
    Do you know what has deformed, Pins, Rotor or Carrier?

    Regards
    Leachy
  • John.R
    John.R
    5 years ago
    Sounds fine unless you can visibly see the buttons n carriers are fucked and flogged out.
    My galfers out of the package do exactly the same. Theres gotta be Enough room for expansion. 

    Some discs have those wavey spacers in the buttons to take up play (my bmw s1k has this so they dont flop around).
  • Nutty
    Nutty
    5 years ago
    1mm of freeplay in a floating disc isn't an issue Ralph. Gee, one muddy race and a new fresh disc on my MX bike will have that much. I'll wager the factory spec for freeplay is >1mm. The nubs between the spider and the discs are a pretty exact science, not commercially viable to repair. 'Braking' make a really good-value replacement if it worries you. 
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