Dorman 528-121 Suspension Control Arm - Rear Left Upper Forward

Dorman 528-121 Rear Left Upper Forward Control Arm

This Dorman suspension control arm is a direct replacement for the rear left upper forward position on select BMW vehicles. Built from steel with a casting/forged construction and powder-coated finish, it is engineered for dependable suspension service on BMW 528i, 535i, 550i, 640i, 650i, and 740i applications.

Key Features

• Direct replacement suspension control arm for the rear left upper forward location
• Steel construction with casting/forged design for strength and fit
• Powder-coated black finish for added surface protection
• Rubber bushings included for OE-style suspension isolation
• Standard replacement grade for select BMW rear suspension repairs
• Part number 528-121 for easy identification and ordering

Detailed Description

Dorman 528-121 is a rear left upper forward suspension control arm designed for specific BMW rear suspension layouts. It is compatible with a wide range of BMW 5 Series, 6 Series, and 7 Series models, including 2011-2016 BMW 528i, 2011-2016 BMW 535i, 2011-2016 BMW 550i, 2012-2018 BMW 640i, 2012-2018 BMW 650i, and 2013-2015 BMW 740i. The steel body, bent shape, and rubber bushings are selected to match the demands of rear suspension service while maintaining proper alignment geometry. This part cross-references MOOG Chassis Products RK642863 for the same application.

Common Problems This Part Can Address

• Rear suspension clunking or knocking from worn control arm bushings
• Uneven tire wear caused by loose or deteriorated rear suspension components
• Excessive rear-end play or instability during braking and cornering
• Alignment issues related to a worn rear left upper forward arm
• Restoration of factory-style suspension response on BMW rear suspension systems

Installation Notes and Tips

Verify vehicle fitment by year, model, and rear left upper forward position before installation. This control arm is not pre-greased, does not include a ball joint, and does not include mounting hardware. Because suspension components affect alignment, a professional wheel alignment is recommended after replacement. Confirm bushing orientation and torque fasteners to the vehicle manufacturer’s specifications during installation.

Quality Assurance

Dorman designs this suspension control arm as a precision-engineered replacement and subjects it to rigorous testing for reliable service on the specified BMW applications. Part number 528-121 is built to serve as a standard replacement for worn original equipment components.