A control arm bush is an essential component of a car suspension system. Its primary function is to provide a cushion between the car frame and the control arm. This helps in reducing the road noise, vibrations, and wear and tear caused by the car's movement. A control arm bush enhances the car's stability and steering capabilities, making it easier for the driver to control the vehicle. Additionally, it also helps in maintaining the wheel alignment and correcting the steering angle, which can improve the car's overall driving experience.

However, over time, control arm bush can wear down, crack, and eventually fail. This can cause the car to produce clunking sounds or experience uneven tire wear. In extreme cases, complete failure of the control arm bush can make the vehicle difficult to steer, pose a danger to passengers, and damage other parts of the car's suspension system. Therefore, regular maintenance and inspection of control arm bush are necessary to ensure the car's safety and avoid costly repairs.