Dorman 520-911 Suspension Control Arm and Ball Joint Assembly - Front Left Upper

Reliable Suspension Control Arm and Ball Joint Assembly

The Dorman 520-911 suspension control arm and ball joint assembly is engineered for select Mercedes-Benz models, including the 300SD, 300SE, 400SE, 400SEL, 500SEC, 500SEL, 600SEC, 600SEL, CL500, CL600, S320, S350, S420, S500, and S600. Designed to restore proper suspension function, this assembly combines durable materials and pre-installed components for a straightforward replacement.

• 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 light suspension grade applications
• One mounting hole with 12.3 mm diameter
• Control arm dimensions: max width 288.5 mm, max length 237 mm

Product Details and Specifications

This Dorman suspension control arm and ball joint assembly (part number 520-911) features a forged and cast aluminum control arm designed for light suspension grade use. The assembly comes pre-greased, eliminating the need for additional lubrication during installation. Rubber bushings are included to provide vibration dampening and reduce noise. The ball joint is press-in mounted with a pinch stud type and a 14 mm thread diameter, ensuring secure attachment and reliable steering response. The control arm is finished in black to resist corrosion and maintain durability over time. Mounting hardware is included for a complete installation package.

Compatible Mercedes-Benz Models

This assembly is compatible with a range of Mercedes-Benz vehicles, including the 300SD, 300SE, 400SE, 400SEL, 500SEC, 500SEL, 600SEC, 600SEL, CL500, CL600, S320, S350, S420, S500, and S600 models. It is designed to meet the suspension requirements of these vehicles, ensuring proper fit and function.

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
• Loose or failing ball joints compromising vehicle handling
• Vibration and noise from deteriorated suspension components

Installation Notes and Tips

Installation of the Dorman 520-911 control arm and ball joint assembly requires basic suspension knowledge and tools. Since the ball joint comes 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. It is recommended to have a professional alignment performed after installation to maintain proper suspension geometry.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-911 suspension control arm and ball joint assembly undergoes rigorous quality testing to ensure durability and performance. This product includes a limited warranty against defects in material and workmanship, providing confidence in its reliability for Mercedes-Benz suspension repairs.