What is this Gunk in my Rear reservoir. - Page 4 - BMW K1600 Forum : BMW K1600 GT and GTL Forums
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post #31 of 37 Old 10-22-2019, 12:37 PM Thread Starter
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Then you should know the difference between "argue" and "discuss".



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I'll just let you have the last word. All will be good then.

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post #32 of 37 Old 10-22-2019, 08:46 PM
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So I shined a flashlight against the side of my reservoirs, and both of them have that same crud/gunk/sediment on the bottom, amd even up the sides part way. Is it a bad idea to drain the reservoir empty to clean that out? Will that introduce too much air into the lines? Or better to leave 1/8 of fluid, and use a cotton swab (Q-tip), to clean the reservoir?
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post #33 of 37 Old 10-22-2019, 08:54 PM
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Originally Posted by atc250r View Post
So I shined a flashlight against the side of my reservoirs, and both of them have that same crud/gunk/sediment on the bottom, amd even up the sides part way. Is it a bad idea to drain the reservoir empty to clean that out? Will that introduce too much air into the lines? Or better to leave 1/8 of fluid, and use a cotton swab (Q-tip), to clean the reservoir?
Dump it, clean it, refill it but just don't PUMP it while empty!
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post #34 of 37 Old 10-22-2019, 09:11 PM Thread Starter
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Dump it, clean it, refill it but just don't PUMP it while empty!
I sucked mine out and then refilled it. If you turn it upside down, add fluid and wait for the air to migrate out of the hose. A few taps on the hose help.

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post #35 of 37 Old 10-22-2019, 09:18 PM
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Good thread and good to know. Still perplexed what this could be after only two years. I know that is the scheduled limit to the fluid but I wouldn't think crud would be present.

I'm thinking I'll go yearly with the change...can't hurt.
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post #36 of 37 Old 10-22-2019, 09:44 PM
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Every time I read the title of this thread I read "Whats this junk in my rear reservoir" and then I chuckle. Yes, I am a child.
capav8r, Prince, peanut and 1 others like this.

2012 K1600 GTL
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post #37 of 37 Old 10-25-2019, 12:30 AM
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Well since you brought it up, it does look kinda like what the Dr removed from a cyst on my back last month.yuck..


During the early 70's, Harley was new to disc brake technology.. Factory installed dot3 brake fluid did not handle moisture well. It didn't stop the bike either. We found several remedies to this: pressure washing seemed to let enough water past the brake piston o-ring and/or the little vent hole in the master cylinder cap to contaminate the fluid. The dot3 fluid was not moisture friendly. It heated up rapidly and boiled out. Dot5 fluid helped some, but there was a lot more to it than that...Anyway I think the awful nastiness you have found has something to do with water...as someone mentioned earlier, the entire fluid system needs to be flushed and replaced. It is spendy but well worth it..
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