Dorman 520-939 Suspension Control Arm and Ball Joint Assembly - Front Left Lower Forward

Durable Suspension Control Arm and Ball Joint Assembly for BMW 540i and M5

The Dorman 520-939 suspension control arm and ball joint assembly is engineered to restore precise handling and suspension performance for BMW 540i and M5 models. Designed with quality materials and pre-installed components, this assembly offers a reliable replacement solution for your vehicle's suspension system.

Key Features of the Dorman 520-939 Control Arm Assembly

• Pre-greased ball joint for immediate use without additional lubrication
• Includes rubber bushings to reduce vibration and improve ride comfort
• Aluminum control arm construction for strength and corrosion resistance
• Press-in ball joint with threaded stud for secure mounting
• Mounting hardware included for straightforward installation
• Compatible with BMW 540i and M5 suspension systems
• Control arm dimensions: maximum width 288.5 mm, maximum length 237 mm
• Black finish for corrosion protection and durability

Detailed Description of the Suspension Control Arm and Ball Joint Assembly

This Dorman suspension control arm and ball joint assembly (part number 520-939) is designed specifically for BMW 540i and M5 vehicles, ensuring proper fit and function. The control arm is made from forged aluminum, providing a balance of lightweight strength and resistance to corrosion. The assembly comes pre-greased, eliminating the need for initial lubrication, and includes rubber bushings that help absorb road shocks and reduce noise. The ball joint is press-in mounted with a threaded stud, allowing for secure attachment and reliable steering response. With mounting hardware included, this assembly simplifies the replacement process and helps restore your vehicle's suspension geometry.

Common Suspension Issues Addressed by This Control Arm Assembly

• Worn or damaged control arm bushings causing excessive play or noise
• Ball joint wear leading to steering looseness or uneven tire wear
• Corroded or weakened control arm compromising suspension integrity
• Vibration or instability during cornering or braking
• Misalignment issues affecting vehicle handling and tire life

Installation Notes and Tips for BMW 540i and M5 Owners

When installing the Dorman 520-939 control arm and ball joint assembly, ensure the vehicle is securely lifted and supported. Remove the old control arm carefully, noting the orientation and mounting points. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary before installation. Use the included mounting hardware and torque all fasteners to manufacturer specifications. After installation, a professional wheel alignment is recommended to maintain proper suspension geometry and tire wear.

Quality Assurance and Warranty Information

Dorman manufactures this suspension control arm and ball joint assembly to meet or exceed OEM standards for fit, form, and function. The aluminum control arm and rubber bushings are selected for durability and performance under regular driving conditions. This part is backed by Dorman's limited warranty, providing coverage against defects in materials and workmanship for a specified period. Refer to Dorman's warranty policy for detailed terms and conditions.