Dorman 521-585 Suspension Control Arm and Ball Joint Assembly - Rear Left Upper Forward

Dorman 521-585 Rear Left Upper Forward Control Arm

Dorman 521-585 is a direct replacement suspension control arm and ball joint assembly for specific BMW applications. It is built for the rear left upper forward position and is engineered to restore smooth ride quality, directional stability, and predictable handling on BMW X5 and BMW X6 models.

Key Features

• Direct replacement for the original equipment control arm and ball joint assembly
• Fits the rear left upper forward suspension position
• Aluminum control arm construction for a lightweight OE-style design
• Ball joint is included and installed with a threaded stud type
• Pre-greased assembly with rubber bushings
• Press-in ball joint mounting type with mounting hardware included
• Black finish and casting/forged control arm type

Detailed Description

This Dorman suspension control arm and ball joint assembly is built for BMW X5 and BMW X6 rear suspension service where the original arm has worn bushings, loosened ball joint movement, or developed handling noise. The aluminum arm, rubber bushings, and pre-greased ball joint are selected to match the needs of light-duty suspension service while supporting consistent alignment behavior. Dorman 521-585 is a practical OE-style replacement for the rear left upper forward position on 2007-2018 BMW X5 and 2008-2019 BMW X6 applications.

This part cross-references MOOG Chassis Products RK621119 for the same application.

Common Repair Symptoms

• Clunking or knocking from the rear suspension
• Uneven tire wear caused by worn suspension geometry
• Loose or unstable rear-end handling
• Excessive play from a worn ball joint or bushing
• Alignment issues after suspension wear

Installation Notes and Tips

Verify the rear left upper forward position before ordering, since this assembly is application-specific. Inspect adjacent suspension components, fasteners, and alignment settings during replacement. Because the ball joint is press-in and the assembly includes mounting hardware, proper suspension service tools and a post-installation alignment check are recommended after installation on BMW X5 and BMW X6 models.

Quality Assurance

Dorman uses an industry-leading evaluation process to help ensure the replacement assembly delivers the ride quality, directional stability, and predictable dynamics expected from an OE-style suspension component.