Re: [GS-911] R1200GS - rear brake circuit pressure too high

[dirk1....@telenet.be]

Flushing/bleeding the circuit is the best thing you can do. You need to bleed at 11 points, if you want to to all 4 circuits.
How long since the last time it was flushed? This type of ABS is sensitive to residue from old brake fluid. It's also sensitive to pushing back the brake calipers/pistons when changing brakepads. Always open the module's circuit cover when you need to push back the pistons.
Worst case: new ABS module, but hopefully it's solved by flushing.
Also clean the Speedo/abs sensor in the rear drive while you're at it.....

good luck

Rgds

Dirk

----- Oorspronkelijk e-mail -----
Van: "Hugo Lord" <hugol...@gmail.com>
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Verzonden: Zondag 12 mei 2013 21:18:15
Onderwerp: [GS-911] R1200GS - rear brake circuit pressure too high

Hi,

I'm hoping someone can help.

I have a brake problem, no real surprise on a 2005 R1200 GS I guess. Red triangle on, ABS warning light rapidly flashing.

The GS-911 is showing fault code 24972, pressure in rear brake circuit too high. No ABS, but front servo working fine. When left overnight, the pressure in the rear brake circuit slowly drops to 'normal' and the rear brake peddle activates the servo. A couple of seconds later, the red triangle starts rapidly flashing and rear servo stops activating, residual braking only to the rear.

The rear brake switch seems to be correctly adjusted and rear brake pads are fine, no sign of brakes binding. I have a horrible feeling it is a problem (a valve sticking maybe?) in the rear brake circuit of the ABS module. Just before I sell the kids to afford a replacement ABS module, any suggestions? I am planning to flush all the circuits, replace the brake fluid and clean the filters on the ABS module but after that I don't know what else to check.

Regards

Hugo

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[Mole C]

Don't forget the mechanical linkages under your foot, is the pedal adjusted right, is it sticking

On 12 May 2013 20:18, Hugo Lord <hugol...@gmail.com> wrote:

Hi,

I'm hoping someone can help.

I have a brake problem, no real surprise on a 2005 R1200 GS I guess. Red triangle on, ABS warning light rapidly flashing.

The GS-911 is showing fault code 24972, pressure in rear brake circuit too high. No ABS, but front servo working fine. When left overnight, the pressure in the rear brake circuit slowly drops to 'normal' and the rear brake peddle activates the servo. A couple of seconds later, the red triangle starts rapidly flashing and rear servo stops activating, residual braking only to the rear.

The rear brake switch seems to be correctly adjusted and rear brake pads are fine, no sign of brakes binding. I have a horrible feeling it is a problem (a valve sticking maybe?) in the rear brake circuit of the ABS module. Just before I sell the kids to afford a replacement ABS module, any suggestions? I am planning to flush all the circuits, replace the brake fluid and clean the filters on the ABS module but after that I don't know what else to check.

Regards

Hugo

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[Hugo Lord]

Hi Dirk,

I really appreciate the trouble you took to reply.

The bike is in France and a long way from a BMW dealer so has to be 3 years since the brake fluid was done. I haven't fancied tackling the brake and ABS module bleeding myself but having researched it on line it is not so different to normal brakes if care and time is taken. I have done conventional brakes a few times and with the added motivation of the cost of a new module if unsuccessful will try my hardest to resolve the problem with a flush and fluid change.

Regards

Hugo

[Hugo Lord]

The rear pedals is correctly adjused, the GS-911 test is good and the switch activates at the right point as far as I can tell. I will double check it though.

Regards

Hugo

[Marco S Hyman]

On May 12, 2013, at 12:18 PM, Hugo Lord <hugol...@gmail.com> wrote:

> Just before I sell the kids to afford a replacement ABS module, any suggestions? I am planning to flush all the circuits, replace the brake fluid and clean the filters on the ABS module but after that I don't know what else to check.

It's a long shot, but check the ABS filters, too.
http://www.advrider.com/forums/showpost.php?p=15016545&postcount=11

[Hugo Lord]

Thanks, I'll certainly try that as well. The pressure in the rear brake circuit is 60 bar, if the sensor goes it normally throws up a pressure of 108 bar or thereabouts apparently. I may just be lucky enough to have some success with a flush and filter clean.

Regards

Hugo

[dirk1....@telenet.be]

Hi Hugo,

Besides the phenomenal braking their's another advantage to the electrical servo ABS on the '04-'06 GS1200: You do not need a vacuumpump to flush and bleed the system. You can pump the fluid through by mildly touching the brake lever. Because this pumps very fast, I've transformed a plastic bottle, to fit in the ABS module, that way you can fill the bottle with brake fluid and do not have to mind running out of fluid while flushing. The level in the abs module is very hard to see. I bought a plastic cap at a BMW dealer, and glued that to the bottle using epoxy, that way I don't have spills.
Be ware to bleed/flush the system in the correct order. You need to flush the wheel circuit and the control circuit.
I'll send an english ABS 3 service manual to your gmail address. If you take the time it's fairly easy to do.

Rgds,

Dirk



----- Oorspronkelijk e-mail -----
Van: "Hugo Lord" <hugol...@gmail.com>
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Verzonden: Dinsdag 14 mei 2013 00:23:40
Onderwerp: Re: [GS-911] R1200GS - rear brake circuit pressure too high

Thanks, I'll certainly try that as well. The pressure in the rear brake circuit is 60 bar, if the sensor goes it normally throws up a pressure of 108 bar or thereabouts apparently. I may just be lucky enough to have some success with a flush and filter clean.

Regards

Hugo

[Peter....@protoma.se]

Hello Dirk !
I am very interested in that manual to if its possible ?
Do you have an picture of you're special tool ?
Best regards Peter Carlzon


Skickat från min iPad

14 maj 2013 kl. 09:50 skrev "dirk1....@telenet.be"
<dirk1....@telenet.be>:

[Marco S Hyman]

On May 14, 2013, at 12:38 AM, Peter....@protoma.se wrote:

> I am very interested in that manual to if its possible ?

This doc calls iABS, aka whizzy brakes, abs3.

The tools: http://advwisdom.hogranch.com/Wisdom/abs3_filling_adapter.pdf
The procedure: http://advwisdom.hogranch.com/Wisdom/service_abs3.pdf

Lots of pictures in both.

[Peter....@protoma.se]

Soooo greatful !

Skickat från min iPad

[Hair]

Have you checked that the rear fluid reservoir pipe to the rear master
cylinder is not twisted ?????
I have seen this and it can cause excessive pressure.

On 12 May, 20:18, Hugo Lord <hugolor...@gmail.com> wrote:
> Hi,
>
> I'm hoping someone can help.
>
> I have a brake problem, no real surprise on a 2005 R1200 GS I guess. Red triangle on, ABS warning light rapidly flashing.
>
> The GS-911 is showing fault code 24972, pressure in rear brake circuit too high. No ABS, but front servo working fine. When left overnight, the pressure in the rear brake circuit slowly drops to 'normal' and the rear brake peddle activates the servo. A couple of seconds later, the red triangle starts rapidly flashing and rear servo stops activating, residual braking only to the rear.
>

> The rear brake switch seems to be correctly adjusted and rear brake pads are fine, no sign of brakes binding. I have a horrible feeling it is a problem (a valve sticking maybe?) in the rear brake circuit of the ABS module. Just before I sell the kids to afford a replacement ABS module, any suggestions? I am planning to flush all the circuits, replace the brake fluid and clean the filters on the ABS module but after that I don't know what else to check.
>
> Regards
>
> Hugo

[Leif Johansen]

First of all, what model and how much milage?


Mvh Leif
Sendt fra min iPhone

[Hugo Lord]

Hi,

Yes, I've checked the rear brake pipes and all is OK. Also checked the rear brake switch is properly set up with the GS-911 and manually.

Regards

Hugo

[Hugo Lord]

The bike as a 2005 model and only covered 8,000 miles.

That might well be the problem in itself. The GS-911 shows brake activation times of 20minutes for the front and 17 minutes for the rear. Lack of use (I'm lucky enough to have other bikes) makes me think a valve may be sticking or passageway blocked. The servos sound strong when they actually activate and the GS is in superb overall condition having seen little wet weather riding.

Guy at DSMC has been vey helpful and sent some pics and instructions on how to check the pressure relief valve that sits on top of the ABS module. As I had the same fault briefly last year I am beginning to think a full fush of the circuits, cleaning the ABS filters and checking of the pressure relief valve might just work. Well,I can live in hope anyway!!

Regards

Hugo