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.
If your car makes noise when turning and it's the grinding type, the most likely cause is bad or worn out wheel bearings. They are designed to be the buffer between axle and the wheel itself, which prevents friction between the two moving parts.