Dorman 521-522 Suspension Control Arm and Ball Joint Assembly - Front Right Upper

Overview of Dorman Suspension Control Arm and Ball Joint Assembly

The Dorman 521-522 suspension control arm and ball joint assembly is designed for select Mercedes-Benz models, including GL320, GL350, GL450, GL500, GL550, ML63 AMG, ML320, ML350, ML450, ML500, ML550, R63 AMG, R320, R350, and R500. This assembly combines a durable aluminum control arm with a pre-installed ball joint to provide reliable suspension performance.

• 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
• Compatible with multiple Mercedes-Benz GL, ML, and R-Class models
• Mounting hardware included for straightforward installation
• Control arm dimensions: maximum width 288.5 mm, maximum length 237 mm
• Black finish for corrosion resistance and durability

Detailed Product Description

This Dorman suspension control arm and ball joint assembly (part number 521-522) is engineered to meet the suspension needs of various Mercedes-Benz vehicles. The control arm is constructed from lightweight aluminum using casting and forging methods, ensuring strength and resistance to wear. The assembly comes pre-greased, eliminating the need for additional lubrication during installation. Rubber bushings are included to reduce road noise and absorb shocks, contributing to a smoother ride. The ball joint features a threaded stud and a press-in mounting type, designed for secure attachment and reliable steering control. The black finish helps protect the control arm from corrosion, extending its service life.

Compatible Vehicles and Applications

• Mercedes-Benz GL320, GL350, GL450, GL500, GL550
• Mercedes-Benz ML63 AMG, ML320, ML350, ML450, ML500, ML550
• Mercedes-Benz R63 AMG, R320, R350, R500

This assembly is intended for light suspension grade applications and is not adjustable. It is suitable for replacing worn or damaged control arms and ball joints to restore proper suspension geometry and vehicle handling.

Common Issues Addressed by This Assembly

• Excessive suspension noise or clunking
• Uneven tire wear due to misaligned suspension
• Loose or unstable steering feel
• Vibration or harshness over bumps
• Worn or damaged control arm bushings or ball joints

Installation Notes and Tips

Before installation, verify compatibility with your specific Mercedes-Benz model and year. The assembly includes mounting hardware for ease of installation. Since the ball joint is pre-greased and installed, no additional lubrication is necessary. Use proper tools to press the ball joint into place if removal or replacement is required. Torque all fasteners to manufacturer specifications to ensure safety and performance.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. This suspension control arm and ball joint assembly undergoes quality inspections to ensure durability and reliability. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.