hello
how far do you have to press the hub back in in order not to rub on the knuckle or not cause brake drag?
i think mine could be not in enough.
thx

 

Just press it in until you cannot anymore.
Hub has a lip on it to prevent over shooting where the bearing needs to be centered on.
Usually you can press the hub end flush with the bearing and it is fully inserted.
It would be pretty obvious if the hub was not pressed on all the way as the stub axle would not fully protrude through and the axle nut would not fully thread down. Or if it did it would not hold the torque and you would just keep tightening until it either fully seated or you would have to constantly re-torque the axle stub nut until it was fully seated.