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Quote:
Originally Posted by V8COOPMAN
If the piston in the MASTER CYLINDER does not return COMPLETELY to the retracted position after each application or stroke, the tiny orifice that allows fluid return and the relief of built-up pressure, will remain covered and cause the pressure to rise as in your symptoms. Make sure that the return spring pulls the pedal COMPLETELY UP after each application. There also should be a space of 1/16" or so between the pedal pushrod and the M/C piston when the pedal is fully retracted. DD
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You have made a very good point with your advice. I'd bet heavily this is exactly what the issue is or very closely related.
The fact that the car did not do this prior to sitting up for two years may indicate contaminants in that weep hole as well.