ABS brake failure warning light - BMW Luxury Touring Community
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  #1  
Old Nov 25th, 2007, 3:59 pm
shunte3 shunte3 is offline
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ABS brake failure warning light

Recently purchased a '02 LT w/ 29K mi. Getting an alternating ( 1 sec flashing ) general warning light & ABS brake failure light when braking at anything more than light stopping. Can pull over, turn bike off, re-start bike and lights re-set until another med or hard braking situation. (lights will not come on under light braking) Tried using front brakes only under hard braking only once did lights start flashing. Tried using rear brake only, lights flashed immediately. Front brake reservoir is full, rear looks to be 1/2" below MAX line. Local dealer (185 mi away) service dept. stated to check rear pad thickness (measures 3.5 mm, book states min. is 1.5mm) that as pads wear more fluid needed to squeeze pads together. However, book states bike w/ Integral ABS, the brake fluid level in the reservoir does NOT drop as pads wear.......any advice?
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  #2  
Old Nov 25th, 2007, 4:25 pm
astuber astuber is offline
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Top off the rear reservoir to the max line. Most of the brake fluid sensors are very sensitive and the fluid level almost has to look like it is overfilled to keep from getting the ABS failure lights. You may have to pull the side panel off to get access to refill the reservior. I usually take off the passenger foot plate and the side panel because of my large hands. My LT usually requires a refill in the fall when the weather turns cooler.
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Old Nov 25th, 2007, 7:43 pm
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jzeiler jzeiler is offline
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If the lights are coming on after a hard application of brake I would suspect a low/weak battery condition to be the culprit. The system is sensitive to battery terminal voltage and the pump motors do draw a considerable current under hard braking.

The key off reset is sort of a clue. The low reservoir fault would still be there. Get a good charge on the battery and see how she does, but it may be time for a replacement.

The only reservoir that will not drop as the pads wear is the front one. The rear reservoir is dual chambered (for your year) and is shared with the front and rear wheel circuits (which drop) and the rear control circuit (which would not if it wasn't shared).
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Old Nov 26th, 2007, 9:45 am
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gglove gglove is offline
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Quote:
Originally Posted by shunte3
Recently purchased a '02 LT w/ 29K mi. Getting an alternating ( 1 sec flashing ) general warning light & ABS brake failure light when braking at anything more than light stopping. Can pull over, turn bike off, re-start bike and lights re-set until another med or hard braking situation. (lights will not come on under light braking) Tried using front brakes only under hard braking only once did lights start flashing. Tried using rear brake only, lights flashed immediately. Front brake reservoir is full, rear looks to be 1/2" below MAX line. Local dealer (185 mi away) service dept. stated to check rear pad thickness (measures 3.5 mm, book states min. is 1.5mm) that as pads wear more fluid needed to squeeze pads together. However, book states bike w/ Integral ABS, the brake fluid level in the reservoir does NOT drop as pads wear.......any advice?
I had the same problem two different times. Both times it was low break fluid in the rear reservoir, under the seat.
Hope it cures your flashing lights.
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Old Nov 26th, 2007, 10:09 am
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Chipper Chipper is offline
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My 02 did the same this past weekend, checked rear brake and found fluid low in forward reservoir. Added fluid lights quit flashing.
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Old Nov 27th, 2007, 12:33 pm
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eeherold eeherold is offline
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I too had the same problem. After checking the fluids and pads, I replaced the rear brake pads. They looked good, but were not. Replacing the pads ($37) solved the problem.
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Old Nov 27th, 2007, 8:33 pm
studawg studawg is offline
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I also had the same problem this year. I topped of all the reservoir and still had the problem. Changed back brakes and still had flashing lights. Changed the front and problem solved.

It appears that even with full reservoirs low break pads will set the sensor to flashing.

Best of luck.
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  #8  
Old Nov 28th, 2007, 1:19 am
Morley Morley is offline
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Same problem 2 weeks ago, after topping off fluids didn't work I changed the battery and problem solved.
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Old Nov 28th, 2007, 12:09 pm
shunte3 shunte3 is offline
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Thanks

A big thank you to all who gave advice. One day I'll be able to return the favor.
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Old Nov 28th, 2007, 12:12 pm
shunte3 shunte3 is offline
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Thumbs up ABS brake failure warning light

A big thank you to all who gave advice. It's appreciated.
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  #11  
Old Jan 23rd, 2008, 8:21 pm
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bikertz bikertz is offline
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I have had a similar problem. Last winter, whenever the temp dropped below 40, the lights would start flashing. Since I still had the original battery which was 5 years old, I replaced the battery. This didn't completely solve the problem, but it was better. This winter it has started again, except now it's when the temp falls below 50. I've topped off the rear fluid reservoir and charged the battery and it only took about 20 mins to reach full charge. Went out the next day, and the first time I hit the brakes, the light started flashing. That afternoon the temp was in the low 70s, and not once did the lights flash. Today was a cooler day, and it started again. All it takes to stop them from flashing is to turn off the ignition switch and restart the bike. I had the dealer check the error codes on the brake system, and it only showed a fault from about 3 or 4 months ago.
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Old Mar 31st, 2011, 2:12 pm
whejdak whejdak is offline
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Re: ABS brake failure warning light

OK, I now have the same problem. I've looked under the seat and don't see the brake reservior. I see what looks like the antifreeze reservior. Is there a window showing the level somewhere? Similar to the cups on the handle bars?

Bill
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Old Mar 31st, 2011, 2:36 pm
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vernvernvern vernvernvern is offline
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Talking Re: ABS brake failure warning light

Quote:
Originally Posted by whejdak
OK, I now have the same problem. I've looked under the seat and don't see the brake reservior. I see what looks like the antifreeze reservior. Is there a window showing the level somewhere? Similar to the cups on the handle bars?

Bill
Bill,
Look on the other side, tucked down in below some frame. There are TWO reservoirs there and it's usually the forward one that's causing the blinking. Top them both off to the TOP with DOT 4 brake fliud. This is true for an "03 LT and others, but NOT all years. Check your book.

Hope that helps you some!
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  #14  
Old Apr 2nd, 2011, 1:43 pm
whejdak whejdak is offline
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Re: ABS brake failure warning light

I found and filled the reservior. The front portion was low. But, it's still blinking.
any new ideas?

Bill
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  #15  
Old Apr 2nd, 2011, 5:00 pm
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jzeiler jzeiler is offline
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Re: ABS brake failure warning light

You have driven it since you filled the reservoir? It must go through the self test and roll test to clear the wig wag lights.
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Old May 21st, 2011, 12:05 pm
MYAGER MYAGER is offline
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Unhappy Re: ABS brake failure warning light

I have checked both reservoirs and filled, disconected battery, Checked for faults and found none. Still flashing 1 second intervals. 2005 LT ABS ..
What else can I try?
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Old May 21st, 2011, 4:37 pm
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Re: ABS brake failure warning light

Just one more question for Bill as sanity check for my sake. This one second flashing is occuring as you ride down the road right? If so go ahead and add a little fluid to the rear part of the reservoir as wel. These are pretty sensitive to slightly low conditions.


This is a picture of the 05 reservoirs for MYAGER. These are the reservoirs (with the funnels in them) you filled?
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  #18  
Old Jun 22nd, 2011, 8:11 am
MYAGER MYAGER is offline
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Thumbs up Re: ABS brake failure warning light

Thanks for picture Really helped
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Old Jul 9th, 2011, 9:24 am
MYAGER MYAGER is offline
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Smile Re: ABS brake failure warning light

Quote:
Originally Posted by MYAGER
I have checked both reservoirs and filled, disconected battery, Checked for faults and found none. Still flashing 1 second intervals. 2005 LT ABS ..
What else can I try?
I, rather (Tim Steele) fixed my problem. It was the illusive 3rd brake fluid reservoir burried on left side. Very hard to get to reservoir....With the addition of small amount of brake fluid it cleared blinking brake warning light..
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Old Jul 9th, 2011, 6:51 pm
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Re: ABS brake failure warning light

Glad you fixed it. There are 4 reservoirs in the system but only the two ON the ABS unit are monitored for fluid level.
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