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Old 04-10-2009, 08:02 PM   #1
CYPKCntrl OP
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F800GS Dirty Brake Fluid

Just had a quick look at the fluid in my rear brake reservoir on my F800GS, and it is absolutely filthy! The bike has less than 2000 km on it, 90% on the street, and I've never touched the reservoir. Anyone have any ideas why this would occur?
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Old 04-10-2009, 08:20 PM   #2
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I'm not sure what you mean by absolutely filthy. But if it's just turned dark brown, it's perfectly normal.

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Old 04-10-2009, 09:23 PM   #3
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Dark brown is normal? I honestly thought that it meant contamination. After a little more research, I'm finding out that the colour doesn't really mean much. Thanks David.
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Old 04-10-2009, 09:51 PM   #4
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No sweat, CTPKCntrl. And don't worry, there will be plenty of other things to go wrong with your bike. Hopefully, none of them too serious.

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Old 04-11-2009, 06:04 AM   #5
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brake fluid color

David:

I'm not in a panic, but I am surprised that ONLY the rear fluid is changing color and doing it rather quickly....

My front reservoir is same color as it was when I picked up the bike last August, but rear was very dark. Just for grins I sucked out all the fluid in the rear and replaced it with fresh stuff.

After only a few 100 miles the rear reservoir was pretty dark again....
Kinda weird.............

I have ABS, while I think CYPK does not.............
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Old 04-11-2009, 06:31 AM   #6
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Quote:
Originally Posted by JRWooden
David:

I'm not in a panic, but I am surprised that ONLY the rear fluid is changing color and doing it rather quickly....

My front reservoir is same color as it was when I picked up the bike last August, but rear was very dark. Just for grins I sucked out all the fluid in the rear and replaced it with fresh stuff.

After only a few 100 miles the rear reservoir was pretty dark again....
Kinda weird.............

I have ABS, while I think CYPK does not.............
My hunch, and it is only that, is that there's considerably less fluid in the rear brake system (one rotor vs. two, shorter brake line, smaller reservoir). So it darkens faster than the front. It's heat, not contamination. The fluid in my front reservoir is a lighter color than the rear, but it's definitely darker than when I picked up the bike 6000 miles ago. If you guys are worried that the color in the rear reservoir is unusually dark, you may want to check with your dealer. But if contaminants were getting in there, I'd think you'd probably also notice some seepage or other evidence of a leak somewhere in your system.

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Old 04-11-2009, 07:47 AM   #7
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Brake fluid

On my 1150 the rear fluid always got dirty much quicker. Never seemed to matter.
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Old 04-11-2009, 09:47 AM   #8
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Quote:
Originally Posted by JRWooden
David:



I have ABS, while I think CYPK does not.............
I do have ABS as well. Also, I just talked to my dealer, and their opinion was the same as on this board - it's caused by heat and should be no issue. However, on their recommendation, I'll still bring it in for a quick inspection.

Interestingly, I have the rear suspension set up a little stiffer, which tends to cause the rear ABS to engage a lot more when I brake aggressively.
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Old 04-11-2009, 04:19 PM   #9
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Weird let me know what the dealer says...

As David points out, it is smaller, closer to the ABS unit, etc.
I have the F658GS, so single front disk, but the reservoir is considerably farther from the "action" than the rear is ....

Jim
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Old 08-07-2009, 09:00 PM   #10
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So, I road over a mountain pass this weekend and going down (12 miles) the rear brake was at 85%+... Washing the bike today I noticed the fluid to be almost syrup color! Ok, so its all from heat and its no big deal, I don't feel any fade etc etc...

My question is about whether there is an fluid out there that won't discolor so quick and maybe better? Wow, I just opened the can of worms.

So on top of that, I don't see a quick bleed valve. Anybody installed one. Would it really take that long to run new fluid through?
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Old 08-08-2009, 04:54 AM   #11
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Joel:

I had not seen that tool .... looks interesting.

Only on the ABS equipted bikes (as I understand it) there is a 3rd bleeder screw up on the handlebars at the front brake master cylinder. I guess they were worried about an air bubble?

I know some of the older BMW ABS systems had a couple of bleeder screws on the ABS controller unit its self, but that does not seem to be the case on these bikes???

Just trying to make this all make sense .... any comments appreciated!

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Old 08-08-2009, 10:15 AM   #12
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It's the plastic that makes it looks dark. Take the cap off an look inside. You'll notice that the fluid is not as dark as it appears looking from the outside.
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Old 08-08-2009, 10:28 AM   #13
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Quote:
Originally Posted by Navaho
It's the plastic that makes it looks dark. Take the cap off an look inside. You'll notice that the fluid is not as dark as it appears looking from the outside.
so the plastic in the front is different than the plastic in the rear?? Sorry try again! my front is not discolored!
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Old 12-13-2009, 09:54 PM   #14
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You got a brake line or seal falling apart and contaminating the fluid. The fluid should never be brown. Maybe slightly yellow but not brown.
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Old 12-14-2009, 10:49 AM   #15
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Bleeding a rear brake, or replacing the fluid, takes no special tools save a wrench the correct size to twist open the bleed nipple, and a length of tubing to attach to the nipple. You do not need any fancy bleeders to do the work for you. The lever is low and on the right side of the bike, easily operated with your right hand, while your left hand operates the wrench to open and close the bleed nipple. Don't overthink this, just change the fluid.
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