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I'm going to guess it actively controls fluid flow from the master and manipulates bias, potentially on the fly as well. Quite common in modern passenger cars actually.
I see a lot of cars with the same bore for each master cylinder output. So we're pushing the same hydraulic pressure to each axle. The only thing distinguishing the bias from there is each axles respective piston area, disc dimensions and pad height.
Some other manufacturers have the hydraulic circuits setup diagonally from the master/controller. In case one bore fails for whatever reason, you're not stuck with either just front or rear brakes.
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