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Hello, my name is***** for the question. If the problem only occurs when braking then you either have warped rotors or warped front hubs. If the rotors are definitely good then it is more than likely the hubs themselves. In order to measure them you would need a dial indicator. Please let me know if you need more help.
The hubs are new also?
Thanks. I would do a run out test if possible of the rotors while they are mounted to the hubs. That is the only way to tell for sure is there are no issues there. If there is no run out then it can be in the rack if there is too much backlash in it.