Inside I found that the "front" seal that controls the flow of fluid out of the reservoir had failed. It was gooey and had sluffed off some material that was probably blocking the valving. The bore was pristine.
This car has had used DOT-5 fluid since its resurrection 22 years ago. All the brake and clutch rubber was replaced back then so I am very surprised to see seal failure. I guess 22 years is not bad for seal life. However, it's made me think that perhaps I should rebuild the brakes soon... just in case.
Doug L.
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