Abs servo issues - BMW Luxury Touring Community
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post #1 of 7 Old May 27th, 2019, 5:46 pm Thread Starter
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Abs servo issues

I bought a 2005 k1200lt about a year ago. The bike only had 5500 miles on it and had been kept inside an aircraft hanger. I currently have 7800 miles on it. I was out on a ride about a month ago and the brake fail light and triangle came on and would not go out after shutting off the bike and restarting it. I had the original brake lines so I bought new spiegler hoses,flushed and serviced. When I turn the key on the bike goes through the initial start up and I here the servo cycle then the triangle and brake fail light starts flashing. If I apply the front brake I here the servo, if I apply rear brake no servo. If I turn the key back off and apply the rear brake right when I turn the key on , the rear servo will come on until I release the rear brake and then it won’t come back on line. Sorry for the book I just wrote!! Appreciate some insight .
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post #2 of 7 Old May 27th, 2019, 6:36 pm
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Re: Abs servo issues

OK first off the brake fail does flash until you do the rolling part of the self test, then it should go out. If you have the triangle on steady and the fail light is flashing we need to know how fast is is flashing 2 Hz or 4 Hz. This bike has a self reset ABS unit in other words key off cycles do nothing. The failure needs to be corrected and as soon as it is the lights will go off on their own. Since it was only ridden 5500 miles in 14 years so I doubt it had the requisite brake flushes performed every two years. It is good that you replaced the lines and did a flush, do you remember how bad the fluid was when you did that?

Does the brake light come on when you apply the rear brake even though the servo does not?

I suspect you have a 4 Hz flash based on the fact that the rear servo does not come on. With out an actual failure code (from a dealer or GS-911 unit) there is not much more I can offer.

There is some news on repairs from over seas at a UK firm called BBA-Reman and they have an office in MA but that web site does not list the LT ABS unit by PN but since their UK partner can fix then they should be able to.

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 #3 of 7 Old May 27th, 2019, 7:31 pm Thread Starter
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Thank you for the quick response Jzeiler!! I have checked and the brake light does come on when I apply the rear brake. The fluid really didn’t look terrible. I did remove the two filters in the top ports of the abs module and they looked good as well. I will have to see if I can locate a GS911 .
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post #4 of 7 Old May 27th, 2019, 11:34 pm
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Re: Abs servo issues

You do realize there are 4 brake circuits to flush on this bike. A clymers manual will help. If it is the servo, there are a few threads on this forum with places to rebuild you ABS pump if it comes to that. And one in the UK also Germany. Sitting for so many ears with little use is a nasty thing for this system. Some people bypass it physically and move on with no power brakes.

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post #5 of 7 Old May 28th, 2019, 10:45 am
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Re: Abs servo issues

Quote:
Originally Posted by beech View Post
You do realize there are 4 brake circuits to flush on this bike. A clymers manual will help. If it is the servo, there are a few threads on this forum with places to rebuild you ABS pump if it comes to that. And one in the UK also Germany. Sitting for so many ears with little use is a nasty thing for this system. Some people bypass it physically and move on with no power brakes.
A Clymers manual is essential for LT owners, but I don’t think it will help much with iABS. At least my Clymers manual basically says to see a dealer for anything other than brake pad replacement. Maybe a later edition covered the iABS??

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post #6 of 7 Old May 28th, 2019, 11:18 am
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Re: Abs servo issues

For the most part I agree. I tell people to get the OEM DVD and then there is the cry out that it is so expensive. I think for the information in it that it is cheap. You do have to have some mechanical chops to use it as it does not hold your hand.

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post #7 of 7 Old May 28th, 2019, 4:53 pm
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Re: Abs servo issues

Quote:
Originally Posted by beech View Post
You do realize there are 4 brake circuits to flush on this bike. A clymers manual will help. If it is the servo, there are a few threads on this forum with places to rebuild you ABS pump if it comes to that. And one in the UK also Germany. Sitting for so many ears with little use is a nasty thing for this system. Some people bypass it physically and move on with no power brakes.
I think he figured that out since he changed out his brake lines and put a couple of thousand miles on it before the failure happened.
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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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