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as you've bled all corners then it could be a flexible brake line is ballooning under pressure, this can't always be seen from the outside so to test this use a hose clamp on each line in turn to close off then lines one at time . Push the pedal in between and see if you can feel any difference as each line is closed off.
if this doesn't help then its possible that you need to run the ABS pump to move any trapped air insidethe dealer method is to use the diagnostic tool to cycle the ABS during bleeding
however I've had good results buy just taking the car for short drive and stamping on the pedal at low speed to lock the brakes and trigger the ABSand then re-bleed