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If you look at the pressure reserve reservoir on the hydroboost unit it doesn't look like it would hold more than maybe 200 ml considering there's also a piston & spring in the cylinder and it should be good for a couple of brake applications if the pump fails. That suggests it doesn't need a lot for the brakes.
I saw it was suggested that you might feel the occasional hard spot in the steering when manoeuvring and braking at the same time but I've never felt it with my installation.
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