yes hand brake works on rears only. Soudns liek your front...
...rotors have a slight warp which means that they contact the pads at one location as they spin. Ber in mind nothing is perfect. Incidentally, the hand brake operates on a separate set of DRUM shoes inside the rear rotor - it does not apply the discs at all.
If oyu dont feel a vibration when braking, i would not worry about it. If you do, you have found your problem.
Grant
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