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Thread: R1150RT Brake Failure light flashing

  1. #1
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    R1150RT Brake Failure light flashing

    Hi folks,
    I have a 2002 R1150RT with the brake failure light flashing (once per second), which I think means that the brake test failed to complete. Also, the battery appears very weak, so I took the left side fairing off, removed the battery, and discovered that the acid level was below the low mark. Could the brake failure light be related or caused by a weak battery or are these two problems not related? I've had the bike only a short time, so still trying to figure out "stuff" on my own before taking it to a beemer dealer ($$$$!) Many thanks in advance!
    Glenn

  2. #2
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    if you are talking about a red triangle light with an ! in the middle of it- that is a bulb warning lamp. means a tail light bulb is out, at least some of the time.
    If you are talking about your ABS lights flashing, that could well be a battery issue.
    what did your owner's manual say about it?
    Ride Safe, Ride Lots

  3. #3
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    ABS light flashing. I think it must be the weak battery causing the abs brake light to flash. In your opinion are the gel batteries worth the price, especially for the convenience of not having to take the fairing off to add water?

  4. #4
    Raspberry waffles Bob!!! kewlmoose's Avatar
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    Low voltage will cause the ABS to flash an error code. I would recommend getting a gel battery & the correct type of battery charger for gel type batteries. I put a PC Odyssey 680 (not 100% sure of the part #) in my 02 RT and it's worked fine for the last 5 years.
    82 R65LS - gone but not forgotten
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    "Oh good, my dog found the chainsaw"

  5. #5
    Day Dreaming ... happy wanderer's Avatar
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    Forget the gel battery and go buy yerself an Odyssey PC680 AGM battery right here:
    http://sepbatteries.com/pc680-odysse...FdIAQAodtmYK7A

    $110 with free shipping. And a T shirt at the moment.

    Never needs water, more cranking amps and reserve amp hours and built to outlast the others. 90 degree connection adaptors come with it.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  6. #6
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    Odssey battery for BMW

    re: Odssey battery--I went to website and since it comes with male adapters, then is it correct that it comes ready to hook up to the BMW? Also, I assume you would still keep it connected to a battery tender when not riding? Again, many thanks for answering! Please pardon my "dumb questions.

  7. #7
    Yes and yes.
    Frank G.
    Hattiesburg, Mississippi
    2004 R1150RT

  8. #8
    Rally Rat HFD190's Avatar
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    I installed an Odyssey PC680 in 2006 and have kept the battery tender on during winter storage. I run a GPS and use heated gear. Have been very happy, its still holding a charge perfectly!

  9. #9
    Day Dreaming ... happy wanderer's Avatar
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    One of the features of the Odyssey AGM battery is that if it is fully charged when you put the bike up for winter and you remove the negative cable from the battery to eliminate parasitic drain from the clock and ECU there is no need to keep it on a trickle charger. These batteries hold a charge MUCH longer than a lead acid or a gel cell.

    Get it from the horse's mouth here: http://www.odysseybattery.com/batteries.html

    The table comparing regular vs AGM batteries is interesting.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  10. #10
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    Odssey PC 680 battery

    Thanks to everyone who replied. I ordered the battery this evening. The winter is gone (I hope!) and it's time to ride!

  11. #11
    Loading the Bike
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    Once your brake pads get down to the sensors, it will also set off the flashing light.

  12. #12
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    Odssey PC 680 update

    Well, I finally got around to installing the battery; a very tight fit I might add. Also, ran into problem with negative ground wire. The bolt on the negative side was non-removable and attached to the wire, and there was a right angle bracket that interfered with putting the negative battery cable onto the angle adapter supplied by Odssey. Bike starts and runs good, but ABS light is still flashing. Now I'm thinking there really is a brake problem. Could low fluid cause the flashing brake light (the rectangular one under the triangle warning light). I've misplaced my owners manual so not sure what's going on. Any suggestions as to where to start? Is the rear brake reservoir visible without taking the right side fairing off? Many thanks!

  13. #13
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    Flashing abs light

    After asking about checking the brake fluid in the rear reservoir I took a look (duh) and realized that you can see the fluid level by taking the triangular panel off. Both front and rear fluid levels look about right, so I'm guessing I have a brake pad problem (?). Perhaps my sight isn't as good as it was earlier in life, but I have a hard time seeing the brake pad thickness (probably another "duh "). Guess I need to remove the caliper and measure the pad thickness, huh? Could the problem also be that the brake fluid is old and needs bleeding and replacing? I haven't purchased a Mighty-Vac bleeder yet. I did ride the beemer for about 30 minutes this afternoon, and before I pull out of my driveway the flashing abs light went out. One other correction that I said in the last message--actually the triangular light is below the abs (rectangular light). I keep the bike covered, so I sometimes forget where things are. I have owned many bikes in the past, including 3 BMW's, but it's not fun just having purchased a bike, and instead of enjoying riding it (which I have a little), I'm trying to troubleshoot the brake problem. Very frustrating! I'm hoping to do some of the preventative maintenance myself, so having this forum is a life saver.

  14. #14
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by gnrogers View Post
    After asking about checking the brake fluid in the rear reservoir I took a look (duh) and realized that you can see the fluid level by taking the triangular panel off. Both front and rear fluid levels look about right, so I'm guessing I have a brake pad problem (?). Perhaps my sight isn't as good as it was earlier in life, but I have a hard time seeing the brake pad thickness (probably another "duh "). Guess I need to remove the caliper and measure the pad thickness, huh? Could the problem also be that the brake fluid is old and needs bleeding and replacing? I haven't purchased a Mighty-Vac bleeder yet. I did ride the beemer for about 30 minutes this afternoon, and before I pull out of my driveway the flashing abs light went out. One other correction that I said in the last message--actually the triangular light is below the abs (rectangular light). I keep the bike covered, so I sometimes forget where things are. I have owned many bikes in the past, including 3 BMW's, but it's not fun just having purchased a bike, and instead of enjoying riding it (which I have a little), I'm trying to troubleshoot the brake problem. Very frustrating! I'm hoping to do some of the preventative maintenance myself, so having this forum is a life saver.
    First of all it sounds like changing the battery has fixed your ABS warning light problem. There is only one light for the ABS and if it went off after you rode a short distance this is as it should be. It does a self test and you can hear a pronounced whine and sort of clicking noise when it completes and engages and the light goes off. All normal.

    Fluid condition, brake pad thickness and air or moisture in the lines will affect performance but will not make the ABS light show an error. Only the malfunction of the ABS pump or an ABS wheel sensor will do this as far as I know.

    Checking pad thickness is finicky for some but once you see where the notches are cut into the BMW OWM pads it is dead easy. The front brakes can be checked by turning the steering fully one way and the other to check both sides. The rear brake is a bit harder but if you get your head right down in there close to the wheel and look forward at the rear of the pads it can be done on the bike.

    I've attached the BMW factory manual brake maintenance section. Hope it helps.
    Attached Files Attached Files
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  15. #15
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    Brake Light Flashing

    Many thanks. The bike rides fine. I just hope that it's not a bad abs pump, as I've read that they can be very expensive.

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