Dorman 521-749 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Rearward

Overview of Dorman Suspension Control Arm and Ball Joint Assembly

The Dorman 521-749 suspension control arm and ball joint assembly is designed for precise fitment on Audi A8 Quattro, Volkswagen Phaeton, and S8 models. This assembly combines a durable aluminum control arm with a pre-installed ball joint to restore suspension performance and handling.

• Pre-greased ball joint for immediate use
• Includes rubber bushings and mounting hardware
• Aluminum control arm with casting/forged construction
• Press-in ball joint with threaded stud (14 mm thread diameter)
• Compatible with Audi A8 Quattro, Volkswagen Phaeton, and S8

Detailed Product Features and Specifications

The Dorman 521-749 control arm assembly features a lightweight aluminum control arm finished in black, measuring up to 288.5 mm in width and 237 mm in length. The assembly includes rubber bushings to reduce vibration and noise, enhancing ride comfort. The ball joint is press-in mounted and comes pre-installed with a threaded stud for secure attachment. This suspension grade component is designed for light-duty applications and includes one mounting hole with a diameter of 12.3 mm. Mounting hardware is included to facilitate installation without additional parts.

Compatible Vehicles and Application

This suspension control arm and ball joint assembly is compatible with select Audi and Volkswagen models, specifically the Audi A8 Quattro, Volkswagen Phaeton, and S8. The part number 521-749 ensures proper fitment and function for these vehicles, making it a reliable replacement for worn or damaged suspension components.

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 521-749 assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary during installation. 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 suspension components are manufactured to meet or exceed OEM standards. The 521-749 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.