Dorman 520-757 Suspension Control Arm and Ball Joint Assembly - Front Left Upper

Overview of Dorman Suspension Control Arm and Ball Joint Assembly

The Dorman 520-757 suspension control arm and ball joint assembly is designed for select Mercedes-Benz models, including the 300CE, 300D, 300E, and others. This assembly combines a durable aluminum control arm with a pre-installed ball joint to provide reliable suspension performance and improved 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 multiple Mercedes-Benz models from the 300 and 500 series

Detailed Product Features and Specifications

The Dorman 520-757 control arm and ball joint assembly features a light suspension grade type suitable for regular driving conditions. The control arm is constructed from aluminum, offering a balance of strength and weight savings. It measures up to 288.5 mm in width and 237 mm in length, finished in black for corrosion resistance. The assembly includes rubber bushings that help absorb road vibrations and reduce noise. The ball joint is pre-installed and pre-greased, eliminating the need for additional lubrication during installation. It uses a press-in mounting type with a threaded stud of 14 mm diameter, ensuring secure attachment. One mounting hole with a diameter of 12.3 mm is included, and all necessary mounting hardware comes with the package.

Compatible Mercedes-Benz Models

This suspension control arm and ball joint assembly is compatible with a range of Mercedes-Benz vehicles, including the 300CE, 300D, 300E, 300SD, 300SDL, 300SE, 300SEL, 300SL, 300TD, 300TE, 350SD, 350SDL, 380SE, 380SEC, 380SEL, 420SEL, 500SEC, 500SEL, 560SEC, and 560SEL models. The part number 520-757 ensures proper fitment and performance for these specific vehicles.

Common Suspension Issues Addressed

• Worn or damaged control arm bushings causing poor handling
• Ball joint wear leading to steering looseness or noise
• Corroded or bent control arms affecting wheel alignment
• Vibration and uneven tire wear due to suspension component failure
• Difficulty maintaining proper suspension geometry

Installation Notes and Tips

Installation of the Dorman 520-757 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 a proper fit. Verify torque specifications according to the vehicle manufacturer’s guidelines. Alignment check after installation is recommended to maintain optimal handling and tire wear.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 520-757 suspension control arm and ball joint assembly undergoes rigorous quality control to ensure durability and performance. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use.