All of it. The 10 percent figure you occasionally see is nonsense that a lot of people believe just because they've seen it so much.
Quick Answer. Some things that cause a vehicle's front end to make a clunking noise are worn ball joints, a damaged tie rod, broken or loose sway-bar links, hard or damaged shocks, and faulty shock mounts. An automotive professional can inspect the vehicle's front end to locate the source of the clunk. Continue Reading.
Cars and Automobiles. Vibration in the steering when breaking sounds like damaged or warped disks on the front brakes. This will cause the breaking effect to come and go rapidly and if only on one side will cause a pull on the steering. It is possibly something with the suspension system too such as broken wishbone, worn bushes, worn track rod ends, etc. However, I'd expect that to give vibration when accelerating as well as breaking.