A steering knuckle is a crucial component in a vehicle's suspension system. It connects the wheel hub to the suspension and allows for the steering of the vehicle. The steering knuckle pivots on the ball joint and enables the wheels to turn left or right while maintaining stability. Typically made from cast iron or aluminum, the steering knuckle also houses the wheel bearing and supports the brake caliper. Its design is essential for proper alignment and handling, ensuring that the vehicle responds accurately to the driver's steering inputs.