F800GS ABS problem - need help

Discussion in 'Parallel Universe' started by Motowalt, Feb 24, 2010.

  1. Motowalt

    Motowalt UNSTOPPABLE!

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    Hey guys, I did a search, but unsuccessfully.

    Just installed new tires (Heidenau K60's from the previous Battlewings) and now the abs light comes on and the front brakes pulse as if abs is engaging and the lever feel is different.

    Getting ready to head out to Big Bend and need to get this remedied asap.

    Can anyone please advise?

    thanks!
    #1
  2. LILGS

    LILGS Been here awhile

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    were the ABS sensors damaged when rims were removed off bike?

    have a physical look and inspect wiring and sensors..

    if the tyres are matching the placard there shouldn't be a problem!
    #2
  3. Motowalt

    Motowalt UNSTOPPABLE!

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    I don't believe so...

    I removed the rear sensor, but forgot to remove the front one before wheel removal...however, I was using a front Pit Bull stand and it came off and went back on smoothly...
    #3
  4. Motowalt

    Motowalt UNSTOPPABLE!

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    I went back an cleaned the front and rear ABS sensors...no nicks or damage seen in the sensor or wires.

    Also pulled and re-installed the front calipers.

    ABS still engaging/pulsing when front brake is applied.

    After a few tries, the ABS light comes on as if it's showing the ABS is now disengaged and the brakes then work fine. (but I assume I have no ABS at that point...)

    Any ideas?

    I'll be riding mostly dirt this weekend, so nt having ABS should't be an issue, other than I don't know the cause...
    #4
  5. LILGS

    LILGS Been here awhile

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    tell us a bit about the tyres you put on! sizes etc
    #5
  6. Motowalt

    Motowalt UNSTOPPABLE!

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    The new tires are semi-knobbies.
    90-90 21" front (stock size)
    140-80 17" rear

    I also put the recommended amount of Ride On liquid tire sealant into each tire
    (5 oz front, 8 oz rear)...this is the first time I've used Ride On...

    There is no appareant vibration from the sealant...the wheels feel balanced.
    #6
  7. MonsterJ

    MonsterJ I have motopsychosis

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    Walt, I don't think it's your tire combo. I've got the same exact tires and I haven't had a problem with my ABS.
    #7
  8. GB

    GB . Administrator

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    The ABS sensor must be removed prior to removing the front wheel. You may have damaged it. :dunno
    #8
  9. LILGS

    LILGS Been here awhile

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    yer sounds like it..

    the tyre combo isnt a problem, it has to be a sensor related problem. perhaps remove your -ve battery terminal and refit it after 1 minute. it should reset the computer.

    see how that goes.. :D
    #9
  10. Motowalt

    Motowalt UNSTOPPABLE!

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    I'm not sure how I could have damaged the sensor..

    But I'll try disconnecting the battery and hopefully it will reset.

    The bike is loaded on the trailer so we'll mess with it after we get there.

    Thanks for everyones help.
    #10
  11. RedHawk47

    RedHawk47 Adventurer

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    Simple question: Is the tire in correctly, or did you flip sides?
    In other words, is the ABS slotted rotor on the correct side?
    #11
  12. Motowalt

    Motowalt UNSTOPPABLE!

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    Double checked that one
    Yes it's on the correct side...
    Hmmmm..

    Well off to Big Bend, hope to have some pics for you all..
    #12
  13. GB

    GB . Administrator

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    Have fun at Big Bend and come see us in Ride Reports with lots of pics :deal

    Btw, In the Helge Pedersen Globeriders DVDs on the 800GS, he stresses how important it is to remove the ABS sensor prior to removing the wheel.. anyway, take it to the dealer and see what they say.. sometimes the best lessons learned are from one's own pocket.. DAMHIK :(:
    #13
  14. Airbornexts912

    Airbornexts912 Adventurer

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    Had the same problem. Different tires....I put the stockers back on and the problem went away put the TKC's on and the problem came back....the ABS on that bike SUCKS!!!!! Almost cost me my life on road with TKC's...the fix after all the problems with the 800 GS???? IE bad front rim, poor chain, axle recall, I could go on and on, but sell it and buy a KTM...
    #14
  15. dukedar

    dukedar 60 easy payments!

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    Resetting the computer by disconnecting the battery will also bring up the 'Service Due' indicator won't it?

    I am not sure if it resets after a minute or two, but I swapped the pig tails for my battery tender and up popped the 'Service Due' date.

    From there it is a dealer reset unless you have the GS-911 reader. Just saying... :dunno
    #15
  16. JRWooden

    JRWooden Long timer

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    Hmmmmmmmmmm I did the reset a while back and it did not trigger the "service due" indicator ...

    BTFOM............
    #16
  17. wacuff

    wacuff F800GS

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    I removed the front tire this weekend 'gently', swapped out the punctured tube, remounted etc. and started to ride again straight away. Within minutes the ABS solid light was on indicating that the system was 'off.' Pulled over on the side of the road (night) got a flashlight going and saw that the black plastic sensor was actually touching the rotor. After further investigation it seems that the last owner never replaced the left side axle bushing which served as a spacer for the sensor.

    I tried loosening up the axle tension just enough to get the ABS sensor some distance, and it worked for about the next 24 hours. This morning on the way into work it was back on again, telling me in angry red letters that I still have a problem.

    Anyone have any tips on this? Will be getting that bushing asap but really don't want to replace the whole ABS sensor component....
    #17
  18. DolphinJohn

    DolphinJohn Caveman

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    I'm on my second set of TKC's and the ABS works just fine.

    How did it almost cost you your life?
    #18
  19. PackMule

    PackMule love what you do Super Moderator

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    Back the sensor out with a washer between the sensor and the mount.
    #19
  20. lawe

    lawe lawe

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    Have You compared Your how long it takes to stop the bike with/without ABS when You have knobbies on? Try it on tarmac and You're in for a surprise. I bet You will stop faster whith the ABS disabled (under controlled circumstanses). At least I do.

    I'm not that impressed with the ABS on the F800 when running on knobbies. I think it's to sensitive for knobbies since they loose grip faster than a road tire. To me it seems as the ABS kicks in "between the knobs". I like the ABS on my 650GS thumper better since it let's the tire lock a split second longer between the ABS pulses which gives better brake performance with knobbies. I think the ABS pulses are slower on my 650GS and that's why I think it performs better with knobby tires than the F800.

    Having said this I still think there are advantages with the ABS on the F800 compared to not having ABS. But I think BMW could do a better job on the ABS of the F800.
    #20