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Thread: 2003 K1200GT - Brake warning, ABS shutdown

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  1. #1
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    2003 K1200GT - Brake warning, ABS shutdown

    I had my first ABS failure that lasted about two miles running around town.

    No strange noise, no leaks seen, just a dead brake like an old 1960's drum brake power.

    Brake warning light flashing, so I knew something was a wrong. Nothing scary in particular. I was near home, so pointed that direction. A few miles later, everything returned to normal. Full brake power, power assisted front and rear. Continued my journey, then it happened again a couple miles later for a short 200 yards or so. Then back to normal. Weird.

    Temp 45 outside today in Chicago.

    GS-911 tool reports no faults. No faults to clear, No ECU engine complaints. More weird.

    I thought possibly the rear brake fluids were over the MAX and too full. Tonight I lowered them to the middle of Max Min line. Fluids were changed about 200 miles ago. Right now brakes are firm and strong. Front brake reservoir is full possible too high as I can't see a line in the bubble. I didn't lower that one but could. I know it is not empty just at the top of the bubble viewer.

    Air bubble in the ABS controller? Temperature change in the 50s vs 30s prior days? Reservoirs too full the problem? April 1st joke on me? Is this a common event?

    Thanks for your suggestions.
    Attached Images Attached Images
    2003 K1200GT

  2. #2
    Registered User GTRider's Avatar
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    All brake systems, not just the wheel circuits, were recently flushed and bled?

    The failure mode you describe sounds more like an electrical issue in the brake system, like possibly an ABS control module that has a loose, dirty, or corroded connection or connector. That would be the inexpensive fix, just removing/cleaning/reinstalling the connector. If it is not a connector, the you could have a problem in the ABS module itself and that’s an expensive replacement. Module Masters in Idaho *might* be able to rebuild a malfunctioning ABS module.

    Good luck,
    DG
    DGerber
    1983 R80ST — 1984 R80 G/S PD — 1993 R100GS — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT
    BMWMOA#52184, AMA#271542, IBA#138

  3. #3
    Debbie's Servant Lee's Avatar
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    Did you check both chambers in that reservoir?
    attachment.jpg

    Also I would double check the reservoir on the handlebar.
    With clean fluid it may be hard to see the fluid line.
    It might be too low instead of too high.
    Look when turning the bars left to right or just remove the cap.
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  4. #4
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    Thanks for the ideas. The second to last picture is the rear inside reservoir. The line is hard to see but at the Max line.

    I will pull out some fluid on the handlebar to be able to check it, but I think it is full. Also check the connector once I find the location. That electrical sounds like the most likely. Bike is dry and indoor stored but can corrode. It sounds like having the reservoirs too high is not an issue. I wanted it normal filled anyway.

    See if it reappears today.

    john
    2003 K1200GT

  5. #5
    Enjoy The Ride saddleman's Avatar
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    The only reservoir that is monitored is the duel reservoir on your bike. Both need to be full or past full or they can throw a fault. Some will throw a fault at the max line or if the fluid is just below it. Check the floats in the duel reservoir.
    Dave Selvig
    2008 Black LT
    2004 Black LT
    2000 Canyon Red LT

  6. #6
    Registered User GTRider's Avatar
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    Normal behavior from a too-low reservoir is to trigger the constantly flashing and alternating dash warning lights but to NOT drop into residual braking mode, where no boost activity is present. My money is still on an intermittent electrical issue (dirty or corroded connector block, loose or broken wire, etc.) or an impending failure of the ABS module. Still hoping for the former,

    Best,
    DG
    DGerber
    1983 R80ST — 1984 R80 G/S PD — 1993 R100GS — 2004 K1200GT w/Hannigan S/C — 2010 K1300GT
    BMWMOA#52184, AMA#271542, IBA#138

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