I hit a big rock on the highway the other day and now when I hit my brakes at around 10 mph and slow down to a stop while still applying pressure to the brake I get this wierd noise as if when you sit down on a leather seat it makes that vibration noise. Any ideas would help alot.

 

jack car up and inspect underside for damage, then pull wheel off, again inspect for damage.

 

it sounds like your abs is activating may have damaged a sensor ring or sensor its self

 

With the car still, push down on each front corner. If you hear
the noise, it might be bushings.