Q: What causes the knocking and creaking from my Model S front suspension?

The usual culprit is worn rubber bushings in the front lower control arms. Tesla’s factory bushings use a soft rubber that we’ve found wears out in as little as 30,000 to 50,000 miles under the weight and grip the Model S puts through them, which produces knocking, creaking, and steering slop. These arms replace the whole assembly with sealed spherical bushings already pressed in, so you fix the cause rather than chase the noise.