The knuckle attaches the wheel end braking components to the suspension. Knuckles are typically custom designed for each application per customer vehicle and loading requirements. The knuckle attaches to the suspension points, such as upper and lower control arms (via ball joints or pinch bolts), struts, and/or tie rod ball joints. The bearing and caliper are typically bolted to the knuckle. Knuckles can be machined from ductile iron or aluminum depending on customer preference for cost versus mass savings.

Starting with only suspension geometry points and desired vehicle parameter data, BWIGroup can design and manufacture a knuckle for specific customer applications. Utilizing the latest analysis software and 40 years of knuckle design experience, mass optimized knuckles are created to meet customer structural requirements. Each knuckle undergoes a rigorous knuckle development process that includes FEA analysis and optimization of static loading events, fatigue loading events, and any additional customer defined loading events. The knuckle design is then subjected to a validation schedule proven through years of real world production applications.

BWI designs are available in a full portfolio to support small car to full size truck and SUV applications in both cast iron and aluminum materials.