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Suspension and steering are the systems that keep a commercial vehicle wheels located, cushion the ride, and let the driver control direction. This category groups the parts that do this, including the steering linkage and joints, the king pins or ball joints the wheels pivot on, and the control arms, rods, and bushings that locate the axle and absorb the road. Many of these are safety-critical.

The steering parts carry the driver's input from the wheel out to the front wheels, pivoting at joints and king pins so the wheels turn accurately. The suspension parts locate each axle and let it move over bumps while keeping the wheels correctly aligned, with bushings and a stabilizer bar controlling movement and body roll. Together they give a heavy vehicle stable, controllable handling under load.

These parts wear at their joints, bushings, and bearing surfaces, and torn boots or perished rubber speed up the process. Common signs include loose or wandering steering, clunking over bumps, vibration, body roll in turns, and uneven tire wear. Because worn steering and suspension parts affect control and some can fail suddenly, they should be inspected regularly by a qualified technician, and an alignment done after replacing locating parts.

The right part depends on the vehicle model, the axle and steering or suspension design, and the part dimensions. Use the categories below to find the specific component, and confirm each part against the vehicle specification before fitting.