Interesting that it is only during breaking. Is the wobble side to side OR up and down OR front and back movement - I presume you are feeling this from the steering wheel or is it the entire front end of the car shakes?

I would guiess from past experiend on otehr vehicles:

sided to side generally means the wheels need to be balance (you stated the tires are new and this was happening before.

up or down/back and forth movement - generally disc are warped. Those are my guess.

Good luck