If it is a quick jerk/bump felt when you first hit the brakes, it is most likely the thrust rod bushings. That is a hell of alot more common than warped rotors, and warped rotors would all but shake the steering wheel out of your hand at higher speeds, and be a constant shimmy under braking.

Drive the X at about 10 mph and repeatedly give a quick application/release of the brakes, that "bump" you feel is the bushings. Another way to get an idea if it is your bushings is to feel for the tell-tale bump/clunk when you come over curbs and parking bumps. They almost always feel sturdy in a shake test, but if you peek at them with a flashlight, you will see the rubber tearing at the center when they are worn.

But from the sound of it, it is most likely the bushings in question

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