Dorman 520-920 Suspension Control Arm and Ball Joint Assembly - Front Right Lower

Durable Suspension Control Arm and Ball Joint Assembly for BMW Models

The Dorman 520-920 suspension control arm and ball joint assembly is engineered to restore precise steering and suspension performance for select BMW vehicles. Designed specifically for models like the 320i, 323Ci, 325i, 328i, 330i, and Z4, this assembly offers a reliable replacement option that meets regular suspension grade requirements.

• Pre-greased ball joint for immediate use
• Aluminum control arm with casting/forged construction
• Includes mounting hardware for straightforward installation
• Press-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with BMW 320i, 323Ci, 325i, 328i, 330i, and Z4 models

Product Features and Specifications

The Dorman 520-920 control arm and ball joint assembly features a lightweight aluminum control arm constructed through casting and forging processes, providing a balance of strength and weight savings. The ball joint is pre-installed and pre-greased, eliminating the need for additional lubrication during installation. This assembly includes one mounting hole with a diameter of 12.3 mm and comes with all necessary mounting hardware. The ball joint uses a press-in mounting type with a threaded stud, ensuring secure attachment and compatibility with the specified BMW models. Note that bushings are not included in this assembly.

Compatible BMW Models and Applications

This suspension control arm and ball joint assembly is compatible with a range of BMW vehicles, including the 320i, 323Ci, 323i, 325Ci, 325i, 328Ci, 328i, 330Ci, 330i, and Z4. It is designed to meet the suspension needs of these models, providing a direct replacement that maintains factory suspension geometry and handling characteristics.

Common Suspension Issues Addressed

• Worn or damaged control arm causing poor steering response
• Ball joint wear leading to suspension noise or looseness
• Vibration or uneven tire wear due to suspension misalignment
• Corrosion or fatigue in original control arm components
• Failed suspension components affecting vehicle stability

Installation Notes and Tips

Installation of the Dorman 520-920 assembly requires basic suspension repair tools and mechanical knowledge. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary. Ensure the mounting hole aligns correctly with the vehicle’s frame and torque all mounting hardware to manufacturer specifications. It is recommended to have a professional alignment performed after installation to maintain proper suspension geometry and tire wear.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit and function. The 520-920 control arm and ball joint assembly undergoes rigorous quality control to ensure durability and performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to Dorman’s official documentation for exact warranty terms.