they told me awhile ago
that it was the inner lining of the brake fluid hose peeling off
allowing fluid to go only in one direction

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Very sorry to hear about your Knee John -> that's gotta smart...
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it gets better though, the icing on the cake just now ->all DATA LOST
~
i was sitting here showing my wife this lumber machine
and the hard drive just went kapui , dead , no more booty
so off to best buy i go as i type on wifey's puter...