What is this Gunk in my Rear reservoir. - BMW K1600 Forum : BMW K1600 GT and GTL Forums
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post #1 of 37 Old 10-20-2019, 06:49 PM Thread Starter
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What is this Gunk in my Rear reservoir.

I did my first brake bleed on my '18 GTL today and found this gunk in the rear reservoir. Front brake was fine. In 30 years of owning and maintaining bikes I've never seen this before.

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post #2 of 37 Old 10-20-2019, 07:42 PM
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Wow, I wonder what the contamination source is. Time for a flush. Iíd get syringe and evacuate the contamination first.
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post #3 of 37 Old 10-20-2019, 08:34 PM Thread Starter
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Wow, I wonder what the contamination source is. Time for a flush. Iíd get syringe and evacuate the contamination first.
That is exactly what I did. Didn't want that crap in the brake line.

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post #4 of 37 Old 10-21-2019, 07:26 AM
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Water ingress?
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post #5 of 37 Old 10-21-2019, 07:35 AM
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How old was that fluid?
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post #6 of 37 Old 10-21-2019, 07:57 AM
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Looks like a Petri dish lab experiment CDC look out
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post #7 of 37 Old 10-21-2019, 08:32 AM
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I have no idea, but quick google search shows a number of car/ bike owners having the same "dandruff" white gunk in their brake oil?

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post #8 of 37 Old 10-21-2019, 08:43 AM Thread Starter
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Originally Posted by Kuzman View Post
How old was that fluid?
The bike is a early release '18, so about 2 years.

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post #9 of 37 Old 10-21-2019, 08:44 AM
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Good going using the syringe. I would fill the reservoir with fresh fluid and use a vacuum to draw out the brake fluid. I think a mighty vac tool would work well. Make sure you close the bleeder once your were done drawing the fluid out. Also, keep filling the reservoir as you went along with the flush. Donít let the reservoir run dry. Iíd inspect the fluid for any additional contamination once you were done. After the flush, I would then bleed the brakes using the brake pedal on the bike. Since the use of the front brakes are linked to the rear but the use of the rear brake isnít linked to the front, you may want to flush the front brakes as well. Why leave cross contamination to chance?

If Iím not mistaken, the fluid in the abs pump wonít be flushed out during this flushing process. Now I have very limited servicing experience with bmw motorcycles but I suspect these vehicles use a diagnostic tool to cycle the abs pump to flush out the fluid. So, depending on how bad your contamination is, you may want to have a dealer do this for you. Itís a judgment call.

If I found this situation on my bike, I would flush the heck out of both the rear and front brakes. Then I would perform the final bleed to the entire system by using every bleeder screw using the force of the bikes master cylinder.

Good luck!
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post #10 of 37 Old 10-21-2019, 08:45 AM Thread Starter
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I have no idea, but quick google search shows a number of car/ bike owners having the same "dandruff" white gunk in their brake oil?
This had a waxy feel to it like paraffin.

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