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Clutch master cylinder breather


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The plastic cap will have a breather somewhere in its double skin top cap may even breathe at the thread sides


Dont  quite agree with Colin , its static slave as the clutch disc wears the slave piston position  will change and depends on design raise or lower the   reservoir due to small changes in  system  volume


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 I would have thought that the dynamic absolute pressure inside a "sealed" master cylinder was influenced more by temperature than wear or movements of slaves?

Most caps I have seen did have a pinhole but I suspect the flow thru is restricted by the skins & seals as Pete says.






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