Dorman 520-747 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Forward

Overview of Dorman Suspension Control Arm and Ball Joint Assembly

The Dorman 520-747 suspension control arm and ball joint assembly is designed specifically for BMW models including the 525i, 528i, 530i, and Z8. This assembly combines a durable aluminum control arm with a pre-installed ball joint to ensure reliable suspension performance and vehicle handling.

• Pre-greased ball joint for immediate use
• Includes rubber bushings for vibration dampening
• Aluminum control arm with casting/forged construction
• Threaded ball joint stud with press-in mounting type
• Mounting hardware included for straightforward installation
• Compatible with BMW 525i, 528i, 530i, and Z8 models

Detailed Product Features and Specifications

The Dorman 520-747 control arm and ball joint assembly features a light suspension grade type suitable for regular driving conditions. The control arm is constructed from aluminum, providing a balance of strength and weight savings. It measures a maximum length of 237 mm and a width of 288.5 mm, finished in black for corrosion resistance. The assembly includes rubber bushings to reduce noise and absorb road vibrations, enhancing ride comfort. The ball joint is press-in mounted with a threaded stud type, having a 14 mm thread diameter, and comes pre-installed and pre-greased, eliminating the need for additional lubrication during installation. One mounting hole with a diameter of 12.3 mm is included, and all necessary mounting hardware is provided.

Compatible BMW Models and Applications

This suspension control arm and ball joint assembly is compatible with select BMW vehicles, specifically the 525i, 528i, 530i, and Z8 models. It is designed to replace worn or damaged control arms and ball joints, restoring proper suspension geometry and vehicle handling characteristics.

• Restores suspension alignment and stability
• Eliminates clunking or knocking noises from worn ball joints
• Improves steering response and control
• Reduces uneven tire wear caused by faulty suspension components
• Addresses vibration and harshness issues in the front suspension

Installation Notes and Tips

Installation of the Dorman 520-747 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary. Ensure the vehicle is securely lifted and supported before removing the old control arm. Use the included mounting hardware for proper fitment and torque all fasteners to manufacturer specifications. This assembly is not adjustable, so alignment should be checked and corrected after installation.

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-747 suspension control arm and ball joint assembly undergoes rigorous quality control to ensure durability and performance. This product includes a limited warranty covering defects in material and workmanship, providing confidence in its reliability for BMW 525i, 528i, 530i, and Z8 vehicles.