Dorman 520-940 Suspension Control Arm and Ball Joint Assembly - Front Right Lower Forward

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

The Dorman 520-940 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-greased components, this assembly ensures reliable operation and long service life.

• Pre-greased ball joint for immediate use
• Includes rubber bushings for vibration dampening
• Aluminum control arm with black finish for 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

Product Features and Specifications

This suspension control arm and ball joint assembly (part number 520-940) features a light suspension grade type suitable for regular driving conditions. The control arm is constructed from durable aluminum using casting and forging methods, providing strength while reducing weight. It comes pre-greased, eliminating the need for immediate maintenance, although it does not include a grease fitting. The assembly includes rubber bushings to absorb road vibrations and a press-in ball joint with a threaded stud (14 mm thread diameter) for secure attachment. The control arm measures up to 288.5 mm in width and 237 mm in length, with a single mounting hole of 12.3 mm diameter. All necessary mounting hardware is included to facilitate installation.

Compatible Vehicles and Applications

This Dorman suspension control arm and ball joint assembly is specifically designed for BMW 540i and M5 models. It is ideal for replacing worn or damaged suspension components to restore proper wheel alignment, steering response, and ride comfort.

• Eliminates clunking or knocking noises from suspension
• Corrects uneven tire wear caused by faulty control arms
• Restores precise steering and handling performance
• Reduces vibration and improves ride quality
• Addresses ball joint wear or failure symptoms

Installation Notes and Tips

Installation of the Dorman 520-940 assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and pre-greased, no additional lubrication is necessary during assembly. Ensure the mounting hole aligns correctly with the vehicle’s frame and torque all hardware to manufacturer specifications. This part is not adjustable, so proper alignment should be verified after installation. It is recommended to have a professional wheel alignment performed following replacement.

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit and function. The 520-940 control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and performance. While specific warranty details vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to Dorman’s official documentation for exact warranty terms.