Brake failure light & flucuating speedo - K-Bikes.com - Excellence in Motion
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post #1 of 20 (permalink) Old Jun 29th, 2011, 6:44 am Thread Starter
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Brake failure light & flucuating speedo

It's been out of the shop for about 3 days now and this morning about half way through my 40 mile commute, the brake failure light starts flashing and the little red triangle is glowing bright red. Then I notice the speedometer drop to about 10mph and bounce back up to speed. About 3/4 of the way in, the speedo quits altogether (brake failure is still flashing). I tested the brakes and they work fine. The front is normal, but the rear seems to take a little more pressure. I don't use the rear a lot, so I'm not sure if I'm imagining that or not. I get about 5 miles from the office and the speedo decides to work again, but the brake light is still flashing. Any thoughts?

Doug Turner
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post #2 of 20 (permalink) Old Jun 29th, 2011, 9:24 am
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Well the brake failure could just be coincidence or maybe they pulled / pinched the wire a bit too hard while they had it in the shop and now it's the dreaded brake failure light. That should be a simple fix. But the speedo thing....hmm. Sounds like a loose connection. In fact, it all sounds like loose connections some where. Let us know when you find out.

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post #3 of 20 (permalink) Old Jun 30th, 2011, 5:24 pm
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Quote:
Originally Posted by dwsdad
It's been out of the shop for about 3 days now and this morning about half way through my 40 mile commute, the brake failure light starts flashing and the little red triangle is glowing bright red. Then I notice the speedometer drop to about 10mph and bounce back up to speed. About 3/4 of the way in, the speedo quits altogether (brake failure is still flashing). I tested the brakes and they work fine. The front is normal, but the rear seems to take a little more pressure. I don't use the rear a lot, so I'm not sure if I'm imagining that or not. I get about 5 miles from the office and the speedo decides to work again, but the brake light is still flashing. Any thoughts?
This is wild speculation on my part, but maybe the ABS sensor isn't working correctly.

Where does the speedometer get its information about wheel speed? The ABS sensor??

To repeat, this is just a completely wild guess with no real experience. But it may explain both symptoms.
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post #4 of 20 (permalink) Old Jun 30th, 2011, 6:10 pm
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That's what I was thinking, the problems are coincidental enough to suggest a related cause. Find out which wheel speed sensor feeds the speedo reading and check it out, I bet you'll fix both problems.
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post #5 of 20 (permalink) Old Jul 1st, 2011, 6:44 am Thread Starter
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I called Lone Star BMW and described what was happening. They suggested checking the speed sensor. I noticed more on the way home that does kinda point to the speed sensor:

- no speedometer
- no odometer or trip meter
- no cruise (will not set)
- self canceling turn signals won't self cancel
- brake failure light and triangle flashing

I'll check the wiring on the front wheel this weekend. I suspect a broken or pinched wire.

Doug Turner
'86 Concours
'99 K1200LT - gone
'06 K1200GT - the new kid in town
'08 Wing - gone
Marshall, TX
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post #6 of 20 (permalink) Old Jul 1st, 2011, 10:59 am
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My .02:

Final drive failure...
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post #7 of 20 (permalink) Old Jul 1st, 2011, 2:16 pm
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Quote:
Originally Posted by BeniciaRT
My .02:

Final drive failure...

WHAT?
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post #8 of 20 (permalink) Old Jul 1st, 2011, 2:33 pm
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I agree with Chuck as the final drive comment makes no sense unless it was an attempt at levity.
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post #9 of 20 (permalink) Old Jul 1st, 2011, 8:50 pm
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Quote:
Originally Posted by dpancerz
I agree with Chuck as the final drive comment makes no sense unless it was an attempt at levity.
It was both an attempt at humor, and slightly serious...

My 2 failures both were noticed by me from speedo issues.

I would pull the sensor out and see if there are metal shavings stuck to it.

Otherwise it still sounds like a sensor failure, wether it be a borken wire or the sensor itself. That is were all the inputs for the ABS, speedo, and even blinker auto-cancel come from that sensor.

But before pulling a bunch of panels, I'd pull the sensor and check for metal.
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post #10 of 20 (permalink) Old Jul 2nd, 2011, 10:52 am Thread Starter
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Damn. I thought that speedo sensor was on the front wheel.

Doug Turner
'86 Concours
'99 K1200LT - gone
'06 K1200GT - the new kid in town
'08 Wing - gone
Marshall, TX
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