Brake Failure Lights When Hot - BMW Luxury Touring Community
 
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post #1 of 13 Old Aug 12th, 2007, 10:35 am Thread Starter
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Brake Failure Lights When Hot

This is a new 2007 with only 4000 miles. I went on a poker run yesterday and covered about 150 miles. On my way to the last stop both the general warning and the brake failure lights started to blink. I tried both brakes and they seemed to be working normally. The temp indicator was above half but when I stopped I did not hear the fans come on. I let the bike sit for an hour and then had to ride home. Rode carefully and the brakes worked fine.

Put it on the center stand in the garage and tried to check fluid levels. Book says when both lights blinking fluid level is low. Front was easy because as I swung the handle bars level you could see the line of the fluid against the plastic port. Rear is a lot harder because the fluid is the same color as the plastic and I can't discern a line. I have the same problem with the coolant reservoir. I was going to take off the cap on the brake reservoir but where is it and how do you get to it. The book just says how to check it and to use DOT4 fluid but not how to fill it.

This morning I rode around the block to check and the lights are not on. This is now the second time that I have seen a failure light then when the engine cooled over night it went away.

Any ideas or knowledge would be appreciated. I plan on taking down to the dealer on Friday on a different matter and will bring it to their attention.

Thanks in advance.

Bruce

Bruce Buchner
2017 R1200RT Platinum Bronze Metallic
2012 R1200RT Fluid Grey Metallic (Little Girl) Traded on the 2017 RT
2007 K1200LT Storm Grey Metallic (Big Girl) Traded on the 2017 RT
2001 325XI 4dr Sold
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post #2 of 13 Old Aug 12th, 2007, 1:11 pm
 
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Bruce,
I had the same trouble with my 2002 LT. The brake fluid was low in the reservoir behind the right saddle bag. It is hard to get to but when I added fluid, the light quit coming on.

Frank
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post #3 of 13 Old Aug 12th, 2007, 2:48 pm Thread Starter
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Quote:
Originally Posted by fdgibbons
Bruce,
I had the same trouble with my 2002 LT. The brake fluid was low in the reservoir behind the right saddle bag. It is hard to get to but when I added fluid, the light quit coming on.

Frank
I guess the rest of the question is how to get to the reservoir?

Bruce

Bruce Buchner
2017 R1200RT Platinum Bronze Metallic
2012 R1200RT Fluid Grey Metallic (Little Girl) Traded on the 2017 RT
2007 K1200LT Storm Grey Metallic (Big Girl) Traded on the 2017 RT
2001 325XI 4dr Sold
1967 2000CS Coupe (Left it in Germany)
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post #4 of 13 Old Aug 12th, 2007, 2:51 pm
 
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Side plate needs to come off. open RH back case and remove screws (2-3), one more under seat, then take off passenger foot rest. Check level on center stand only. fill to top mark.
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post #5 of 13 Old Aug 12th, 2007, 2:55 pm Thread Starter
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No wonder the book says to check it and nothing about how to top it off if it is low. Thanks

Bruce

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2017 R1200RT Platinum Bronze Metallic
2012 R1200RT Fluid Grey Metallic (Little Girl) Traded on the 2017 RT
2007 K1200LT Storm Grey Metallic (Big Girl) Traded on the 2017 RT
2001 325XI 4dr Sold
1967 2000CS Coupe (Left it in Germany)
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post #6 of 13 Old Aug 12th, 2007, 4:03 pm
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Bruce,


Everyone's advice is a bit wrong. The monitored fluid reservoirs (on the 05 and up) are directly integrated into the ABS unit. You cannot look and see the level. The two vent caps must be removed and then you can shine a light down into the tiny hole to see the level.

This article will get you looking in the right place:

My 05 Addendum

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #7 of 13 Old Aug 13th, 2007, 7:56 am
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You might want to check the speed sensors on the wheels to see if you have a good connection. Does the cruise control work o.k.?

2007 K1200LT Hannigan- Blue
2012 R1200GS - Rallye
1973 R75/5 Toaster - Black
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post #8 of 13 Old Aug 13th, 2007, 9:02 am Thread Starter
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Quote:
Originally Posted by Arby60
You might want to check the speed sensors on the wheels to see if you have a good connection. Does the cruise control work o.k.?

Good point, I'll check. As an update I rode it into work today since it was not showing an error. About 7 miles into the ride the warning lights came on again with the general warning steady and the ABS flashing once per second. Then I noticed the brightness of the lights was fading and growing brighter back and forth like they were going from daytime brightness to night brightness. Then I noticed when I hit a bump the speedometer needle would drop from 70 to about 40 and then come back up. Now I am beginning to think I have a loose connection plug up front somewhere.

I'll try the cruise control on the way home today. When I was on my way home Saturday when this all started the cruise control kept dropping off. At that time I was worried about the brakes and forgot about it until you mentioned it. Does anyone know if there is a central point or plug where all these come together?

The dealer is not open till tomorrow so I will call them first thing and try to get it in.

I appreciate all these good ideas I'm getting.

Bruce

Bruce Buchner
2017 R1200RT Platinum Bronze Metallic
2012 R1200RT Fluid Grey Metallic (Little Girl) Traded on the 2017 RT
2007 K1200LT Storm Grey Metallic (Big Girl) Traded on the 2017 RT
2001 325XI 4dr Sold
1967 2000CS Coupe (Left it in Germany)
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post #9 of 13 Old Aug 13th, 2007, 5:39 pm Thread Starter
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Arby,

You were correct the cruise control is nonfunctional also. Can anybody tell me how to check the wheel sensors?

Thanks,

Bruce

Bruce Buchner
2017 R1200RT Platinum Bronze Metallic
2012 R1200RT Fluid Grey Metallic (Little Girl) Traded on the 2017 RT
2007 K1200LT Storm Grey Metallic (Big Girl) Traded on the 2017 RT
2001 325XI 4dr Sold
1967 2000CS Coupe (Left it in Germany)
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post #10 of 13 Old Aug 13th, 2007, 11:34 pm
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Brake Failure Lights When Hot

Sounds like your speedometer sensor is bad. I had the same symptoms on my 02. I checked the sensor and it was intermittent. Replaced the sensor, no problems since with the speedo flopping when hitting a bump or blinking brake warning lights. The cruise stays on now too.

Tim Barstow

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post #11 of 13 Old Aug 17th, 2007, 4:30 pm Thread Starter
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Problem Fixed

Just to close out this thread for any who are interested. I just returned from a trip to the dealer where the true cause was established and repaired. This is a new 2007 LT which I purchased in April. Those who stated it was a problem with the wheel speed sensor were correct. I thought the wheel speed sensor was the gismo in the front that has the ring with the vertical slots running by it so that is what I tried to check. Took the Tech at the dealer about 60 seconds to find the problem. The speed sensor that works the ABS, cruise control and speedometer is mounted on a bracket that is bolted to the rear brake unit. Apparently the bolt was not torqued correctly at the factory because it came loose and fell out. That left the sensor dangling so when it was constantly moving in and out of range which accounted for all the erratic readings. They replaced the bolt and checked all the others and it is working fine now.

Learning point for me is I need to do a better job of preflighting my ride. I should have spotted the dangling sensor and I rode it for several days before I could get it to the dealer.

Thanks again to all whole suggested solutions.

Bruce

Bruce Buchner
2017 R1200RT Platinum Bronze Metallic
2012 R1200RT Fluid Grey Metallic (Little Girl) Traded on the 2017 RT
2007 K1200LT Storm Grey Metallic (Big Girl) Traded on the 2017 RT
2001 325XI 4dr Sold
1967 2000CS Coupe (Left it in Germany)
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post #12 of 13 Old Aug 17th, 2007, 7:42 pm
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Bruce,


Thanks for giving us the "rest of the story". That is how we build our knowledge base. No one really thought a new bike would have a failed sensor. Your point is well taken about a good and proper pre-flight check! I would never jump in a Cessna the way I jump on the LT, so I think I will re-evaluate MY pre-flight checks.

Enjoy the ride and hope that is the last of your problems.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #13 of 13 Old Aug 18th, 2007, 12:21 pm
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[QUOTE=jzeiler]Bruce,


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No one really thought a new bike would have a failed sensor.

Mine did. But you're right, we all learn through shared knowledge.

Ray

2007 K1200LT Hannigan- Blue
2012 R1200GS - Rallye
1973 R75/5 Toaster - Black
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