K1300GT Brake failure

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Andrew
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K1300GT Brake failure

Postby Andrew » Fri Jun 26, 2020 10:23 am

On my last two rides, the red "brake failure" light came on part way through the ride and stayed on persistently. Has anybody else had this and does it necessarily mean that the servo unit needs replacing?
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Rob Frankhamr
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Re: K1300GT Brake failure

Postby Rob Frankhamr » Fri Jun 26, 2020 10:54 am

What it means is that you need to get the fault codes read. They will give you a starter for 10 on what's actually happened. Could be one of any number of things up to and including a dodgy battery.

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Re: K1300GT Brake failure

Postby SteveD » Fri Jul 03, 2020 1:47 pm

Did it go to "residual braking"? and if so, how was that?
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Andrew
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Re: K1300GT Brake failure

Postby Andrew » Sat Jul 04, 2020 9:58 am

Hi Rob. I have read the fault codes but they tell me no more than is obvious - i.e. that either the brake controller has failed or the power supply to the controller has failed. I remember from my K11 & K12RS days that low battery voltage can cause this but the battery is pretty sound. Perhaps I should clean the terminals.

Steve. Yes it did revert to residual braking and they work just as effectively. The lever just needs a little more pressure. They seem to have sorted out the problem that the earlier controllers had. The servo on my K11 failed just as I needed to brake hard for a roundabout. I will never forget the terror that it induced as I thought that the brakes had failed completely. It only took a second or two to work out that the brakes were still working but, by that time, I was half way across the roundabout.
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Re: K1300GT Brake failure

Postby Jockboxer » Sat Jul 04, 2020 10:08 am

Check for any fouling of the brake levers and abs sensors. That would be my first thought (in hope of a cheap solution!!!)

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Re: K1300GT Brake failure

Postby Mike D » Sat Jul 04, 2020 11:30 am

Hi Andrew,
The servo on my K11 failed just as I needed to brake hard for a roundabout.
I think you may be getting your systems mixed up., the K1100 had ABS2 which was not a servo system as such. The later bikes R1150 & K1200 R1200 etc had iABS2 which was a full servo system. While the ABS2 is a bit clunky and susceptible to low battery voltage, when they fail you are left with standard hydraulic braking but no ABS function (not 'residual braking' as found on the iABS).

Mike

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Re: K1300GT Brake failure

Postby Jaythro » Sat Jul 04, 2020 2:21 pm

K13GT will be new New evolution ABS that did away with the servo

Sadly what happens is the brushes for the ABS motor bounce back in and stick in their holders and there is no power circuit present for the motor and that immediately flags a failure

BUT in better news there is no residual braking issue with those and its full power braking

The ABS pump motor from a Mk9 fiesta can be fitted (requires some engineering ability!) and removes the issue with the sticky brushes for good!

I did it on a Problematic 06 onwards R1200GSA and its still good 2 years later
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Re: K1300GT Brake failure

Postby Mike D » Sat Jul 04, 2020 3:45 pm

K13GT will be new New evolution ABS that did away with the servo
Indeed, as the old iABS was junked around 2007 I recall.

Mike

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Jaythro
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Re: K1300GT Brake failure

Postby Jaythro » Sun Jul 05, 2020 11:09 pm

K13GT will be new New evolution ABS that did away with the servo
Indeed, as the old iABS was junked around 2007 I recall.

Mike
2006 Mike When there were MU and TU releases Model Update and Technical Update

Its just a shame they did not put them in a more accessible place!!! I had that tank on and off that GSA soooooooo Many times!

Thinking it was fixed (More than once was enough but 3 times was a total pain!)

The Mark 9 fiesta electric motor and it was all solved

You will usually have Integral / servo brakes i.e. 2004 ~ 2006

After that it was the later evolution that did away with 2 control circuits and 2 wheel circuits and went back to the old fashioned in the line ABS
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Re: K1300GT Brake failure

Postby Andrew » Sat Jul 11, 2020 11:17 am

Ah yes, it was probably the K12RS that had the brake failure. I never really trusted it after that.

Jaythro - what kind of engineering? I can do most things in that line. For the last six years I have made my living from repairing, rebuilding and renovating classic motorcycles so I have a well equipped workshop. I will investigate the Ford Fiasco ABS pump motor.

Many thanks to all those who responded.
BMW K1300GT, Sunbeam S8, Ariel VH

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Andrew
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Re: K1300GT Brake failure

Postby Andrew » Sat Jul 11, 2020 11:54 am

I just looked up details about the Mk9 Fiesta. What production year(s) does it span? I can't find reference to anything later than Mk8.
BMW K1300GT, Sunbeam S8, Ariel VH


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