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Discussion Starter · #1 ·
I changed out my brake fluid and after carefully placing cover back on the master cylinder, it weeps a very slight, but noticeable amount of break fluid. I wiped the lid and the tank perimeter and tightened the screws down firmly. What might I have missed that’s causing this?
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I had the same thing happen. I cleaned debris from under the seal grove and replaced the seal for the cover. Still ended up seeping out. Was told by the BMW technician that this is normal if you fill it to max level or just above. When the reservoir is tilted to one side or another it will seep out. Keep the level below "MAX" when the reservoir is level or close enough. If it still seeps lower it a small amount again. This solved my problem.
 

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Discussion Starter · #5 ·
I had the same thing happen. I cleaned debris from under the seal grove and replaced the seal for the cover. Still ended up seeping out. Was told by the BMW technician that this is normal if you fill it to max level or just above. When the reservoir is tilted to one side or another it will seep out. Keep the level below "MAX" when the reservoir is level or close enough. If it still seeps lower it a small amount again. This solved my problem.
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thanks. I’ll try that.
 

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2009 R1200RT Low, 2010 R1200RT Low
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My '10 RT had the same thing. Ate the paint off the cover, so I cleaned the seal, and repainted. It happened again, so I ordered a new seal.

While I was waiting for the new seal, I looked at the old one and it looked fine.

So I figured the top was not sealing well. I mounted a Dremel metal grinding bit in my drill press, and ground the area where the screws go through the cover down (not much, half a mil or so, and be sure to shim the cover so it is ground even). Now the cover squeezes the gasket more.

Stripped and repainted the cover, have ridden 300 or so miles and have not had a problem.

Well, one problem - I have an extra master cylinder seal now.
 

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I had the same thing happen. I cleaned debris from under the seal grove and replaced the seal for the cover. Still ended up seeping out. Was told by the BMW technician that this is normal if you fill it to max level or just above. When the reservoir is tilted to one side or another it will seep out. Keep the level below "MAX" when the reservoir is level or close enough. If it still seeps lower it a small amount again. This solved my problem.
I had same result on my 2007 RT. Dealer suggested might need new master cylinder, but removing a small amount of fluid did the trick.
 
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