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Clutch master cylinder breather


daverclasper
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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

Pete

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Hi,

 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.

Cheers,

Iain.

 

 

 

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