Car wobles a little bit when braking

Seems like a possible brake rotor vibration - like W.Fields suggested, check the brakes. However, I don't know that you must absolutely drop everything to take the car in immediately. On the other hand, you could have a steering or suspension issue causing a "wobble". Maybe it's best to err on the side of caution.

If it's only when you're braking it would be a rotor, but as the other fellow suggested, check around all your tires (in less you can tell what quarter is vibrating. Just feel around your tires to make sure there's no unusual "warps" or "lumps" on any of the tires in case some steel belts are broken inside a tire. Mine was vibrating at slow speed, but ran smooth at normal speed, unfortunately I just had my front driver's tire blow out & nearly caused me a head-on collision. So be careful out there in case it's a tire getting ready to blow!