The steering knuckle provides an attachment point for the tie rod to the wheel.

The steering knuckle also provides an attachment point for the upper and lower ball joints in conventional A frame suspension system. With Macpherson strut systems,the steering knuckle anchors the lower end of the strut and the lower ball joint.

The spindle of a rear wheel drive vehicle is supported and attached by the steering knuckle. With a front wheel drive vehicle, the front hub and bearing assembly is attached to the steering knuckle.

Disc brake systems also use the steering knuckle as a mount for the brake caliper. The components attached to the steering knuckle will usually wear out before the steering knuckle itself. In fact, most of the damage to a steering knuckle will occur from collision damage.

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