Rear Rotor Replacement?

Discussion in 'Parallel Universe' started by rideoregon, Jun 16, 2011.

  1. JRWooden

    JRWooden Long timer

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    I've tried the same approach and have found that:
    1) I fall out of love more often than the average career-man
    2) The money may follow, but it's so damn far behind I can't see it ever catching up to me :lol3
    #21
  2. JRWooden

    JRWooden Long timer

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    Learning to ride off-road I use more back brake than some folks - I think on my bike I'll end up replacing the rear about twice as often as the front (I have the F650GS-twin, so only one front caliper).

    I agree the submarine aspect of the F650GS is disconcerting and would be worse with passenger!
    (I've never ridden an F800GS so can say there)

    Although some folks don't think so highly of them, I installed the Ricor Intiminators
    http://www.advrider.com/forums/showthread.php?t=489675
    and they fixed the U-boat issue I think it was a great modification for the price (if you buy: wait for a sale).

    Yes, blowing a puck would be having a caliper piston leave the bore in the caliper far enough to get cocked and create a huge issue.
    #22
  3. Reaver

    Reaver Outta Here

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    Conversations here can quickly go south due to one mistype or just from the reader being in a bad mood so I tend to tip toe when suggesting a cause might not be the bikes fault. Since I haven't met these people or seen their bikes, one can only specualte. Or ass-u-me.

    The other factor regarding accelerated brake wear is weight. Another touchy subject. A fully bagged out bike or riding two up will definately increase brake wear. I once had the pleasure of trying to explain to a customer why his 658 was sluggish and went through rear brakes so often. He used it like a scooter doing errands in town and never took it on the highway cause it was slow and unsteady. Ummm, the poor bike was severely overloaded just by him sitting on it. Ever seen a lowered 658 overloaded? Ever seen a Russion Bear on a bicycle? I could hear metal groaning noises in my head. The centre of gravity rolled about on every bump or lean. I suggested using the maximum tire pressure. He said that was "two up" pressure and he never carried a passenger. Oh boy.

    All I can say for certain is that it's not a bike specific problem or design error. Maybe a bad batch of rotors..... My F8 and the gf's 658 have been all over and still run the original brakes. Little mud use, reasonably loaded and I suppose I use a lot of engine braking as well.

    As my French buddy always says "sorry bout yer luck!"
    #23
  4. High Country Herb

    High Country Herb Adventure Connoiseur

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    It isn't uncommon that performance aftermarket cost less than OEM, no matter what type of vehicle. Wise choice looking into that. No garantee it will last longer than OEM, but it may have more stopping power. Someone mentioned the green Galfer pads, and that may be a way top extend the life of the rotor.

    I've never actually seen a puck come out of the caliper, but I've seen them become shifty when extended too far. That leads to dragging brakes, because the puck won't retract all the way once damaged. (Subaru) Thin rotors don't dissapate heat as well either, which leads to warped rotors. It's all a vicious circle...

    That reminds me...my old XL has about 1.5mm of pad left, I better change them.
    #24
  5. gus007

    gus007 Been here awhile

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    I am confused by the whole rotor wearing thing. I have replaced rotors on a car but that car had about 150,000 miles on it and I ran it pretty hard, but I have never replaced rotors on a motorcycle due to wear. I've upgraded to stainless steel on my racebike but that was for performance reasons. And I replaced a couple of rotors due to crashes but I would think the rear rotor should pretty much last forever unless you are very large and/or drag the rear break and/or have a very large passenger riding full time. That's my opinion. :freaky

    Because of this thread I went and checked the rear rotor on my bike and it is noticeably grooved and I never use the rear on the pavement but I do on gravel and off-road. I've noticed the rear brake on my bike also has a tendency to lockup . Could this be due to a worn rear rotor? Could this be another one of BMW's ways to reduce costs with substandard components? It's not that expensive to replace with an aftermarket fix so I feel pretty lucky with only having to spend around ~$180 to take care of it.
    #25
  6. Hayate

    Hayate ADV Monkey

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    My girlfriend is pretty sure you're calling her fat! :D

    Galfer did get back to me to double confirm what I found in their catalog btw. Pretty damn sure now the rear rotor available on Amazon is the one for the F800gs (same for f650gs).

    Justin at Galfer wrote:
    Regarding your BMW F 800GS,
    The DF763W rotor is the correct rotor for your bike.
    #26
  7. Hayate

    Hayate ADV Monkey

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    #27
  8. Gaspare

    Gaspare Almost dirt rider

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    You can trust them: they produce quality products - made in Italy.
    Not that sure, but they invented the wave disc; at least they are pioneers in it and their R&D is a world leader (SUNSTAR Group since 2004).

    Last "new" (racing since 2002) is batfly rotor; quite expensive but seems to be effective more than it's cool. :evil
    They anyway produce different options for F800 GS rotors: let's have a look @ http://www.braking.com/ catalog and choose the pony...
    #28