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There is a port timing hole in the fluid reservoir. The primary seal on the front of the piston in the master cylinder must return past this port when the pedal is released. This will release any pressure in the system due to fluid expansion when the fluid gets hot. It is usually a very small...

I have a 1963 Dart with 9" if that helps.

Overfilled master cylinder is a real possiblity. As the fluid expands it needs to be able to get back to the resevoir (thats why there is a port timing hole). If there is to much fluid in the resevoir (front circuit side if partitioned) the expansion will actually start creating pressure in the...