So, typical to the W211 i have another very faing knocking noise coming from the front left wheel. The TOP and BOTTOM ball joints have been replaced. Ive jacked the car up to rocked the wheel and i have zero play in the 9 and 3 position, but i do have a little bit of play in the 12 and 6 postion (top and bottom). Ive ruled out wheel bearing as i would of thought the whole wheel would rock and i havent been getting any humming noises at speed. Also the sound only emerges at around 5mph while driving over a rutted car park. Like i said top and bottom ball joints have been replaced and are working perfectly. Any suggestions on where to look specifically would be great!