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Old 10-19-2012, 12:15 AM   #1
mandon OP
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Oddometer: 95
abs warning again

i got the abs warning plus the red triangle a few months back...seeking advice from here...somebody recommended changing the brake light which i did and it seemed to cure the problem...after 7 weeks in the garage i came back and used the bike, the abs warning and the red triangle again came on....while i was in a motorcade...and i lost the brakes...it will come and it will go...i managed to limp the bike home..with intermittent brakes...and now im due to leave in a few days for another 7 weeks or so....i dont want to leave the bike in this condition...
tried removing the relays and spraying with contact cleaner

i called the dealer and they are quoting about $300 just for picking the bike from my house

again i seek your help...forget to mention...03 1150 gs dual spark abs servo
tia....

mandon screwed with this post 10-19-2012 at 12:23 AM
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Old 10-19-2012, 03:41 AM   #2
Beemerlover
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Quote:
Originally Posted by mandon View Post
i got the abs warning plus the red triangle a few months back...seeking advice from here...somebody recommended changing the brake light which i did and it seemed to cure the problem...after 7 weeks in the garage i came back and used the bike, the abs warning and the red triangle again came on....while i was in a motorcade...and i lost the brakes...it will come and it will go...i managed to limp the bike home..with intermittent brakes...and now im due to leave in a few days for another 7 weeks or so....i dont want to leave the bike in this condition...
tried removing the relays and spraying with contact cleaner

i called the dealer and they are quoting about $300 just for picking the bike from my house

again i seek your help...forget to mention...03 1150 gs dual spark abs servo
tia....
Change the brake light again & check for corrosion in the socket? Just a guess, but who knows?

Good luck.
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Old 10-19-2012, 04:02 AM   #3
jpalamar
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Vague Recollection of . . .

I could be all wrong, but seems I remember somthing about the condition of the battery, AND, even tho' you may ride the bike and/or put it on let's say a battery tender, a substandard battery could affect this?

Sorry if I'm wrong and just am having a bad memory day!
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Old 10-19-2012, 05:37 AM   #4
jsb223
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Location: Waco, Texas USA
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BMW 1100/1150 ABS system checks

iABS fault codes


These should be listed on a sticker supplied with the bike.
Gen OFF, ABS ON = Only residual braking in both circuits.
Gen OFF, ABS flashes at 1Hz = ABS not available. Pull-away test not completed.
Gen OFF, ABS flashes at 4Hz = Only residual braking function available
in both circuits.
Gen ON, ABS off = rear light/brake light defective.
Gen ON, ABS flashes at 1 Hz = At least one brake circuit without ABS.
Gen ON, ABS flashes at 4Hz =At least one brake circuit in residual
braking function mode.
Gen AND ABS flashing alternately at 1Hz = Fluid level in Intergral ABS
too low.Low-voltage


Try and ABS reset according to the procedure in your owner's manual.
Full and fresh brake fluid is a given, do not skimp here. Do the
maintenance or have it done at least as often as recommended by BMW.


Front and rear micro switch test. They should click loud enough to
hear them engage but this by no means is an indication of proper operation.



Check for proper switch operation with a DMM.


Get a DMM "digital multi-meter" and learn how to use it.


Both front and rear switches as NC (normally closed) the opposite of
typical motorcycle brake light switches. Therefore is they are engaged at start up, an
ABS error occurs because of an open circuit in the system.


Make sure the handguard is not touching the front brake lever.
Make sure the metal tab on the rear brake switch is making proper
contact with the rear pedal assembly.


Check your front and rear brake switched again as MOST PROBLEMS ARE
SWITCH RELATED!


Test rear brake light bulb. If you are having problems and have an
aftermarket brake light installed, put the stock bulb back in a test.



Test the tail light element and the brake light element of the bulb.
Check ABS sensor gaps and the "spoke rings" they use to sense wheel speed.

Dirty sensors, sensor gap too large, debris, dirt, missing or damaged
"ring" spokes can all add up to an ABS fault condition. ABS sensor gap 0.45...0.55
mm (0.018 ... 0.022 in) (front and rear).


Battery condition, the bike starts fine, what's the problem. If the
battery voltage drops too much while starting it starts throwing

ABS error codes from the get go.


Pad condition. Although this has been argued back and forth, if the
pads on either end of the bike are near the end of their service life,

replace them. At least one person has claimed this fixed his

ABS problem. More likely the movement of brake fluid
through the system after the pad change fixed the problem but I digress.


If all else fails, disconnect the battery and let sit for 30 minutes,
reconnect battery and give it a try.
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Old 10-19-2012, 05:48 AM   #5
spagthorpe
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From experience on my 04, if it's just the brake bulb, you'll get flashing, but you won't lose the servo assist. If the servo assist is gone, or intermittent, then I would guess it has the same problem mine did; bad pressure sensors. It seems common among the intermittent problems. They are four of them, and if any one of them goes, it seems to kill the whole system.

The other thing though, was being in a motorcade, you were probably on and off the brakes a lot. If your battery is marginal, I could see that being a maybe, especially if you weren't running at enough RPMs to get the motor charging anything. If it's more than three years old, then you could swap it for an Odyssey 680 as a matter of maintenance, and see if it changes anything.

Do you not have a U-Haul center near? Their $15/day motorcycle trailers are the ticket for me. Although, I hate to say, since I started riding BMWs, I've needed to use them a couple of times. Up until then, never had a bike break down....
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Old 10-19-2012, 06:10 AM   #6
Advdave
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All good info above. New battery would be my first try, especially if the fault clears occasionally.
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Old 10-19-2012, 05:30 PM   #7
mudmullet
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My '04 1150GSA needed a rear ABS Sensor. I'd wiggle the bulb and it seems to keep working, and I'd turn off the ignition and then it would start working again. Did all those things for a few months until it finally quit working altogether. My brakes didn't quit working--just the ABS. I bled the brakes and all kinds of things, for weeks. What finally fixed it was buying a GS911 and reading the fault codes. If the dealer is going to charge 300 just to pick it up, I'd get a GS911, instead, and see what it could tell me. I really like to tinker with mechanical problems, so the GS911is really handy. Here's a link to my ABS saga: http://www.advrider.com/forums/showthread.php?t=781406

If your brakes don't work, then your symptoms are different than those I was experiencing. It might be more than simply a sensor.
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Old 10-20-2012, 01:00 AM   #8
Zoef zoef
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Sir,

You may want to replace the rubber hose from the brake fluid reservoir for the rear brake to the rear master cylinder. This will require a filling and bleeding the rear control circuit, but it is worth it. I replace mine half a year ago (same age as yours) and the hose didn't look too good, especially on the inside. The rubber was not smooth anymore, but very small cracks started appearing.
It appears these servo systems are quite sensitive to contamination of the brake fluid. Therefore it can be a good idea to use the normal bleeding method instead of using vacuum to pull the fluid through (which the dealer uses). Using pressure seems to be more effective than vacuum to get the contamination out.
Success.
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Old 10-26-2012, 09:50 AM   #9
mandon OP
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i had no choice but to send the bike to the dealer and...

the gs was diagnosed with faulty abs control unit and was given a quote +/- $3,000 and approximately 3 weeks for the part to arrive since according to them it need to be ordered from germany....
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Old 10-26-2012, 09:55 AM   #10
SJSharkfan
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YIKES! Sorry dude......
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Old 10-26-2012, 10:02 AM   #11
holckster
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Quote:
Originally Posted by mandon View Post
i had no choice but to send the bike to the dealer and...

the gs was diagnosed with faulty abs control unit and was given a quote +/- $3,000 and approximately 3 weeks for the part to arrive since according to them it need to be ordered from germany....
ABS rebuild info (juist googled ABS rebuild BMW motorcycle)
http://www.bmwmoa.org/forum/showthread.php?t=60685
http://xs-adventure.com/motorcycle/b...-brake-failure
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holckster screwed with this post 10-26-2012 at 10:20 AM
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Old 10-26-2012, 10:08 AM   #12
mandon OP
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@sjsharkfan...i was bummed...couldnt sleep for several nights after they told me that...

@holckster....i remember seeing that site here, just cant remember where...

anyway my thanks to those that gave their inputs....
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Old 10-26-2012, 03:51 PM   #13
def
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These ABS systems aren't magic but the BMW dealers have no idea how to repair them (BMW techs are just parts changers these days) so, you need a specialist with the understanding how the ABS systesm works.

Contact Module Master and discuss your symptoms with them. They might want take a crack at repair. The bill will be less than $500.00 and they give a long warranty...worth a try.

There are folks here on this site who know more about the ABS system than BMW. All BMW can do is plug in a diagnostic tool, read out codes, give you a big repair bill and smile.

If I were experiencing ABS problems, the BMW store would be the last place I would go.
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Old 10-28-2012, 12:38 AM   #14
mandon OP
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I got no choice...i have to go back to work....so i just had it sent to stealership....closed my eyes and told em to order the part... and hopefully it will be up andrunning when i come back....
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Old 11-22-2012, 03:07 AM   #15
mandon OP
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update

just got the bill for the replacement of the abs module, 35k pms, bearing replacement, and shaft seal....
amounted to at current exchange rate its a whooping $3823 and some loose change, talked to the guy this morning and the bike is ready for pick up and he said hell try to work a discount ...
darn i could buy another bike with that amount.....
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