When the steering wheel hits a dead bend, there is a ball cage universal joint on the steering wheel of the front drive car, and the included angle between the axes of the two ends becomes the maximum. If the ball cage universal joint is poorly lubricated or excessively worn, it will run badly and produce rattling noise. But as long as the steering wheel is turned back a little, the force on the universal joint will be reduced, and the abnormal sound will be reduced or disappeared.