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Right in the mopar parts catalog when they are describing the MC % they are saying volume or displacement, not pressure.

Think about this. On a mopar MC the front port usually goes to the rear brakes. The only way to have 2 different piston or bore sizes would be for the front piston to be smaller which would generate a higher pressure to the rear brakes. So that would negate your theory, I think.



There are two pistons of the same diameter on a common rod moving the same distance. They move the same amount of fluid per stroke and have the same pressure potential. It doesn't matter if the front of the reservoir or master cylinder bore holds five gallons and the rear only holds six ounces. They both move the same distance.