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Thread: R1200rt-servo brakes strange occurance

  1. #1
    Registered User
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    Mar 2011
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    Lawrenceville,ga
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    R1200rt-servo brakes strange occurance

    Today after having picked up my 06 R1200 RT from getting the fuel strip replaced, I stopped in a dealership near me that is having a Yamaha demo day tomorrow to make sure I knew when the rides started. When I started the bike up to head home the brake failure light came on,but did not go out once I started moving as it is supposed to. I realized that I had no rear brakes and reduced stopping power on the front. Since I was only 5 minutes from home and did have a fair amount of front brake pressure I carefully rode home. Once there I went inside to take my gear off and then came back to see if I could see anything wrong. Nothing obvious, so I started the bike up and heard the servos firing up. I rode down the driveway to see if the problem was still there. The brakes were back to normal. I shut the bike off, restarted and everything was fine again. I rode it to the gas station,filled up, restarted and all was fine.

    Any one have an idea about what may have happened? Was the RT expressing anger towards me for stopping at a Japanese bike dealership?

  2. #2
    not so retired henzilla's Avatar
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    Sep 2006
    Location
    CENTEX USA
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    9,214
    Sometimes low battery voltage causes this, sometimes it is from firing the bike up w/out letting it "boot up".
    Our 1100, 1150, and 1200's have done it at some point. Our K1200S's are really finicky about booting up the display and self check sequence.

    That and you stopped at that other dealer
    Steve Henson
    SABMWRA MOA Club#62's Flat Fixer/ current forum moderator
    It's not the breaths you take, but the moments that take your breath away-D.Dillon/G. Strait

  3. #3
    Debbie's Servant Lee's Avatar
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    May 2003
    Location
    SW Iowa
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    4,107
    Several years ago on a trip to California I had the ABS warning light on 5 or 6 times during the trip. This was on a 03 K1200RS with servo brakes.
    When the light was flashing I still had servo brakes, but no ABS. I had the bike checked when we got home and a Load Test showed the battery was weak. The bike started fine every time on the trip.
    I replaced the battery and never had the ABS problem again.

    On my wife's K1200RS if she did not let the bike do a self check before she started it she would not have servo brakes for the first little bit. My bike was not fussy about the self check, I could turn on the key and start the bike without waiting for the self check. Debbie's bike needed to complete the self check before hitting the start button.
    Lee
    2016 R1200RS
    MOA # 30878
    Past BMW Bikes: 2011 K1300S, 2003 K1200RS, 1991 K75S, 1987 K75T, 1984 R100RT

  4. #4
    Registered User
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    Mar 2011
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    Lawrenceville,ga
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    I don't think the battery is weak, though I will check that out tomorrow. I probably didn't give enough time to for everything to "boot up" as was mentioned.
    Thanks for the responses.

  5. #5

    Battery and Servo

    I had a funny feeling about my servo brakes as I had to squeeze just a little harder recently when first starting up. I thought it was my imagination, but I know my bikes peculiarities well as it is. 05Rt and I have owned her for the past 5 years. I put a new Odyssey battery in last April and I was thinking, no it can't be the battery. Well yesterday, the Nike would only turn over 2x before kaput. Even though the Bat Tender was all green. I exchange the battery under warranty for a new replacement, wha la, no issue with servo when first firing up when foot peddling the bike and braking. Apparently a cell was going bad causing the servo issue and yesterday it went bad giving a false positive on the Bat a Tender charge and only having enough juice on the one cell or cells,to turn over twice before dying. Moral of the story; a healthy battery appears to make all thendifference when these brakes are concerned.

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