Loud Thud Feeling When Braking

Could be many things. One classic test is to put the tranny in N as you approach a stop and then brake. That takes the drivetrain out of the equation. Lift the car by the frame so the wheels are hanging (can do one at a time) and pull on the wheel hard every way, looking for play. My first guess would be worn & thus loose suspension bushings. There is one big one at the lower control arm pivot and two smaller ones where the upper control arm pivots. The adjusters could also be loose.