Dorman 520-555 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Rearward

Durable Suspension Control Arm and Ball Joint Assembly for BMW X3

The Dorman 520-555 suspension control arm and ball joint assembly is engineered to restore precise handling and suspension performance for your BMW X3. Designed with quality materials and pre-greased components, this assembly ensures reliable operation and long service life.

• Pre-greased for immediate installation and reduced maintenance
• Includes rubber bushings and mounting hardware for a complete replacement
• Iron control arm with casting/forged construction for strength and durability
• Press-in ball joint with threaded stud for secure fitment
• Compatible specifically with BMW X3 models requiring a light suspension grade type

Product Features and Specifications

This Dorman suspension control arm and ball joint assembly (part number 520-555) features a black iron control arm measuring up to 288.5 mm in width and 237 mm in length. The assembly includes a press-in ball joint with a 14 mm threaded stud and a 12.3 mm mounting hole diameter. Rubber bushings are pre-installed to absorb vibrations and provide smooth suspension articulation. The package contains all necessary mounting hardware, allowing for a straightforward replacement process. This assembly is designed for light suspension grade applications and is not adjustable.

Compatible Vehicles and Applications

This control arm and ball joint assembly is compatible with BMW X3 models, providing a direct replacement for worn or damaged suspension components. Using the Dorman 520-555 ensures proper fitment and restores suspension geometry for improved vehicle stability and handling.

Common Suspension Issues Addressed

• Eliminates excessive play or looseness in the front suspension
• Resolves uneven tire wear caused by worn control arm bushings
• Corrects steering instability and vibrations
• Replaces damaged or corroded ball joints to maintain safe suspension operation
• Restores proper suspension alignment and ride quality

Installation Notes and Tips

Installation of the Dorman 520-555 control arm and ball joint assembly requires basic suspension tools and mechanical knowledge. Since the ball joint is press-in type and pre-installed, no additional ball joint assembly is necessary. Ensure all mounting hardware is torqued to manufacturer specifications. Although the assembly is pre-greased, periodic inspection of bushings and ball joints is recommended for long-term maintenance.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance and durability. The 520-555 suspension control arm and ball joint assembly comes with a limited warranty covering defects in materials and workmanship. This warranty supports confidence in the product’s quality for BMW X3 suspension repairs.