{"product_id":"dorman-521-521-suspension-control-arm-and-ball-joint-assembly","title":"Dorman 521-521 Suspension Control Arm and Ball Joint Assembly - Front Left Upper","description":"\u003ch2\u003eDurable Suspension Control Arm and Ball Joint Assembly\u003c\/h2\u003e\u003cp\u003eThe Dorman 521-521 suspension control arm and ball joint assembly is engineered for reliable performance in select Mercedes-Benz models. Designed with quality materials and pre-greased components, this assembly supports smooth suspension operation and vehicle handling.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePre-greased for immediate use without additional lubrication\u003c\/li\u003e\n\u003cli\u003eIncludes rubber bushings and mounting hardware for a complete installation\u003c\/li\u003e\n\u003cli\u003eAluminum control arm with a black finish for corrosion resistance\u003c\/li\u003e\n\u003cli\u003ePress-in ball joint with threaded stud for secure mounting\u003c\/li\u003e\n\u003cli\u003eCompatible with multiple Mercedes-Benz GL and ML series models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Features and Specifications\u003c\/h2\u003e\u003cp\u003eThis suspension control arm and ball joint assembly features a forged aluminum control arm measuring up to 288.5 mm in width and 237 mm in length. The assembly includes a press-in ball joint with a 14 mm threaded stud and a 12.3 mm mounting hole diameter. Rubber bushings are integrated to reduce vibration and noise, while the included mounting hardware ensures a straightforward installation. The assembly is pre-greased, eliminating the need for additional lubrication during installation. This part is designed for light suspension grade applications and is not adjustable.\u003c\/p\u003e\u003ch2\u003eCompatible Mercedes-Benz Models\u003c\/h2\u003e\u003cp\u003eThis Dorman 521-521 control arm and ball joint assembly is compatible with the following Mercedes-Benz vehicles: GL320, GL350, GL450, GL500, GL550, ML63 AMG, ML320, ML350, ML450, ML500, ML550, R63 AMG, R320, R350, and R500. It is engineered to meet the suspension requirements of these models, ensuring proper fit and function.\u003c\/p\u003e\u003ch2\u003eCommon Suspension Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWorn or damaged control arm bushings causing suspension noise or vibration\u003c\/li\u003e\n\u003cli\u003eLoose or failing ball joints affecting steering stability\u003c\/li\u003e\n\u003cli\u003eCorroded or weakened control arm compromising suspension integrity\u003c\/li\u003e\n\u003cli\u003eUneven tire wear due to suspension misalignment\u003c\/li\u003e\n\u003cli\u003eReduced handling performance and ride comfort\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman 521-521 assembly requires basic suspension knowledge and tools. Since the ball joint is pre-installed and press-fit, no additional ball joint assembly is necessary. Ensure all mounting hardware is securely tightened to manufacturer torque specifications. The pre-greased components reduce installation time, but verify lubrication points during routine maintenance. This part is not adjustable, so alignment should be checked after installation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman suspension components are manufactured to meet or exceed OEM standards. The 521-521 assembly undergoes rigorous quality control to ensure durability and performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to Dorman’s official documentation for complete warranty information.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43997215654069,"sku":"BKKY-521-521","price":106.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/RB_521521_Fro_3881048f-e3c0-4e7d-ad27-eeee7e3ad529.jpg?v=1775007869","url":"https:\/\/www.partcatalog.com\/products\/dorman-521-521-suspension-control-arm-and-ball-joint-assembly","provider":"PartCatalog","version":"1.0","type":"link"}