Steering wheel/front vibrate when braking at highway speed

did you leave the car sitting for a long time? another possible cause is that rust will build up on the inside of the drums where the shoes are not touching it, but where the shoes are touching will still be clean - this can cause the vibrations you are experiencing.. the harder you stomp the whoa pedal, the more violent the vibration. Also, just because you feel it up front doesn't mean the back ones aren't to blame too - if you find rust on the front ones, best to check the rears too.