Dorman 520-997 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Forward

Durable Suspension Control Arm and Ball Joint Assembly for BMW

The Dorman 520-997 suspension control arm and ball joint assembly is engineered to restore precise handling and suspension performance for select BMW models. Designed specifically for BMW 525i, 528i, 530i, 535i, 545i, 550i, and M5 vehicles, this assembly offers a reliable replacement solution that meets regular suspension grade requirements.

• Pre-greased ball joint for immediate use
• Includes rubber bushings and mounting hardware
• Aluminum control arm with black finish for corrosion resistance
• Press-in ball joint with pinch stud type installed
• Compatible with BMW 525i, 528i, 530i, 535i, 545i, 550i, and M5 models

Product Features and Specifications

This suspension control arm and ball joint assembly from Dorman is constructed from forged and cast aluminum, providing a lightweight yet durable component. The control arm measures up to 288.5 mm in width and 237 mm in length, with a single mounting hole diameter of 12.3 mm. The assembly includes rubber bushings to absorb vibrations and reduce noise, enhancing ride comfort. The ball joint is pre-installed and pre-greased, eliminating the need for additional lubrication during installation. Although it does not include a grease fitting, the assembly is designed for long-lasting performance under light suspension grade conditions.

Compatible BMW Models and Applications

This Dorman 520-997 control arm and ball joint assembly is compatible with a range of BMW vehicles, including the 525i, 528i, 530i, 535i, 545i, 550i, and M5 models. It is an ideal replacement part for owners seeking to maintain or restore factory suspension performance on these specific vehicles.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing steering instability
• Ball joint wear leading to uneven tire wear or clunking noises
• Corroded or bent control arms affecting wheel alignment
• Vibration and poor handling due to suspension component failure
• Loose or damaged mounting hardware impacting suspension integrity

Installation Notes and Tips

Installation of the Dorman 520-997 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 hardware to manufacturer specifications. This assembly is not adjustable, so proper alignment should be verified after installation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-997 suspension control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship.