Dorman 521-128 Suspension Control Arm and Ball Joint Assembly - Front Right Lower

Overview of Dorman Suspension Control Arm and Ball Joint Assembly

The Dorman 521-128 suspension control arm and ball joint assembly is designed specifically for Scion xA and xB models. This pre-greased, steel control arm assembly offers a reliable replacement option for light suspension applications, ensuring proper vehicle handling and alignment.

• Pre-greased for immediate use
• Includes rubber bushings and mounting hardware
• Press-in ball joint with threaded stud included and installed
• Constructed from durable steel with a black finish
• Compatible with Scion xA and xB suspension systems

Detailed Product Description

The Dorman 521-128 control arm and ball joint assembly is engineered as a casting/forged steel component, providing strength and durability for regular grade suspension needs. It features a single mounting hole with a diameter of 12.3 mm and a maximum control arm length of 237 mm and width of 288.5 mm. The assembly comes pre-greased, eliminating the need for additional lubrication during installation. Rubber bushings are included to reduce vibration and noise, while the ball joint is press-in mounted with a 14 mm threaded stud for secure attachment. Mounting hardware is also provided to facilitate a straightforward replacement process.

Compatible Vehicles and Applications

This suspension control arm and ball joint assembly is compatible with the following vehicles:

• Scion xA
• Scion xB

It is designed for light suspension grade applications, making it suitable for everyday driving conditions and maintaining proper suspension geometry.

Common Issues Addressed by This Assembly

• Worn or damaged control arm bushings causing poor handling
• Ball joint wear leading to steering play or uneven tire wear
• Corroded or bent control arms affecting suspension alignment
• Noise or vibration from faulty suspension components
• Difficulty maintaining proper wheel alignment

Installation Notes and Tips

Installation of the Dorman 521-128 control arm and ball joint assembly requires basic suspension repair tools. Since the ball joint is pre-installed and the control arm is pre-greased, the assembly can be installed without additional lubrication. Ensure the mounting hole aligns correctly with the vehicle’s frame and torque all mounting hardware to manufacturer specifications. It is recommended to have a professional alignment performed after installation to maintain optimal handling and tire wear.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-128 suspension control arm and ball joint assembly undergoes rigorous quality checks to ensure durability and performance. This product includes a limited warranty against defects in material and workmanship, providing confidence in its reliability for Scion xA and xB suspension repairs.