Dorman 521-398 Suspension Control Arm - Rear Right Lower

Durable Suspension Control Arm for BMW 525i, 528i, 530i, 540i

The Dorman 521-398 suspension control arm is engineered to provide reliable performance and precise handling for select BMW models. Designed with quality materials and construction, this control arm supports suspension integrity and vehicle stability.

• Constructed from lightweight aluminum with a coated black finish for corrosion resistance
• Includes a rubber bushing with a black color and precise dimensions (14.3 mm inside diameter, 39.6 mm outside diameter, 92 mm length)
• Features a welded ball joint mounting type with a threaded stud (ball joint not included)
• Overall length of 262.5 mm, designed for press-in end type and bushing linkage end
• Compatible with BMW 525i, 528i, 530i, and 540i models

This suspension control arm is manufactured using a casting and forging process to ensure strength and durability. The aluminum material reduces unsprung weight, contributing to improved suspension response. The included rubber bushing helps absorb vibrations and maintain proper alignment, while the coated finish protects against environmental wear. Note that the ball joint and mounting hardware are not included, allowing for customization or reuse of existing components.

Applications and Common Issues Addressed

• Restores proper suspension geometry and alignment on BMW 525i, 528i, 530i, and 540i
• Replaces worn or damaged control arms causing uneven tire wear or handling instability
• Eliminates clunking noises from deteriorated bushings or loose suspension components
• Improves steering response and vehicle control by maintaining correct suspension articulation

Installation Notes and Tips

• Ensure compatibility with your specific BMW model and year before installation
• Use appropriate tools to press in the bushing and secure the control arm
• Ball joint and mounting hardware must be sourced separately if replacement is needed
• Professional alignment is recommended after installation to maintain suspension geometry

Quality Assurance and Warranty

Dorman suspension components are manufactured to meet or exceed OEM standards for fit and function. The 521-398 control arm undergoes rigorous quality checks to ensure durability and performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to official Dorman documentation for exact warranty terms.