I've got an '02 Ford Taurus with 99k miles that's got something loose in the front end but I'm not entirely sure what it is. When under moderate to hard braking there's a quick shaking in the front of the car and the steering wheel jerks in sync with the shaking. Jacked up one front wheel, left the other on the ground, and sure enough the wheel moves when pushed at 3 and 9 o'clock, but not at 12 and 6.

Any advice on where to go from here?