Sounds normal.
My pedal sinks a bit.
If you leave the EPB off but in P and leave the car and lock it, it should do a calibration, one side at a time. Takes about a minute per side as it winds all the way in and out rather than the <1mm it takes to apply the brake.
The fluid level has no bearing on EPB, as the EPB works by turning a threaded rod with a thrust nut screwed onto it. the thrust nut doesnt turn as it is engaged loosely in the back of the calliper piston. It will push the piston on, but won't pull it back, the pads and piston will stay against the disc but not pressed on - the nut is deep and just slides back on it's own.
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