899 899 Rear Brake Stuck On

Discussion in 'Panigale' started by Gabagool, Sep 16, 2020.

  1. Hi guys

    had an issue at the weekend. Quite alarming I must say.
    On a dual carriageway I was losing power and managed to get to a lay-by then the bike stopped straight away (bike was still running). anyway I got off and the break was stuck on. Had melted my speed sensor cable and a bit on the brake cable.

    once it was cool it freed it.
    Anyway, I now need a new rear disc, pads, new cables and the rear calliper re built. £800 later....

    In case anyone else ain’t had this be careful :)
     
    #1 Gabagool, Sep 16, 2020
  2. Glad it didn't turn out worse, @RickyX had similar recently, different bike, possibly the same cause though. :upyeah:
     
    #2 Chris, Sep 16, 2020
    • Like Like x 1
  3. Except...my event cost me nothing as I was able to beg, steal, borrow or already had the parts to fix it!
     
    #3 RickyX, Sep 16, 2020
    • Like Like x 1
  4. Insufficient free play in the brake lever causes that.
     
    #4 razz, Sep 16, 2020
    • Agree Agree x 1
  5. Does that mean the brake lever needs to be tightened/adjusted?
     
    #5 Gabagool, Sep 17, 2020
  6. The stop pin on the lever needs to be adjusted so that there is a couple of mm free play.
     
    #6 RickyX, Sep 17, 2020
  7. People over adjust the rear brake lever losing all the free play this means the brake is constantly on ...
     
    #7 andyb, Sep 17, 2020
  8. Damn! I haven’t adjusted anything though. Does it just work it’s way like that?
     
    #8 Gabagool, Sep 17, 2020
  9. There has to be enough clearance to guarantee that the release port within the actuator is uncovered when lever is unloaded. This port allows the pressure to be released when the brake is not being used, allowing excess fluid into the reservoir when the brake is hot and admitting additional fluid from the reservoir when the brake is cold and the pads wear. If it doesn’t uncover after a brake application, the pressure doesn’t release, the brake drags, gets hot causing more pressure and you get a thermal runaway. I completely wrecked a rear brake when this happened to me 20 miles south of Calais. Piston melted, brake pad backing plate bent, brake disk blued, small fire, total fluid loss. The brake stood no chance against a 160 bhp engine! When it happens on the back brake you usually get away with it. If it happens on the front it can be catastrophic...
     
    #9 razz, Sep 17, 2020
    • Agree Agree x 1
  10. Bloody hell. I think that’s what happened to mine. Disc blued etc.
    So got it back, 10 minutes down the road and happened again :( starting to think maybe it’s the DTC? mechanic stripping it and looking at it again.
    very annoying
     
    #10 Gabagool, Sep 17, 2020
  11. #11 RickyX, Sep 17, 2020
  12. I said all that in one sentence
     
    #12 andyb, Sep 17, 2020
    • Like Like x 1
  13. And I said it in the post immediately before yours...
     
    #13 RickyX, Sep 17, 2020
    • Like Like x 1
  14. In one sentence.
     
    #14 andyb, Sep 17, 2020
    • Like Like x 2
  15. #15 Gabagool, Sep 17, 2020
  16. Traction control has nothing to do with the brake.
     
    #16 990Glen, Sep 17, 2020
    • Like Like x 1
    • Agree Agree x 1
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