{"product_id":"dorman-521-339-suspension-control-arm","title":"Dorman 521-339 Suspension Control Arm - Rear Upper Center","description":"\u003ch2\u003eOverview of Dorman Suspension Control Arm 521-339\u003c\/h2\u003e\u003cp\u003eThe Dorman Suspension Control Arm 521-339 is engineered for reliable suspension performance on select BMW models. Designed with durable steel construction and a coated finish, this control arm supports stable handling and vehicle alignment.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConstructed from high-strength steel with casting and forging methods\u003c\/li\u003e\n\u003cli\u003eBlack coated finish for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes a rubber bushing with black color and precise dimensions (14.3 mm inside diameter, 39.6 mm outside diameter, 92 mm length)\u003c\/li\u003e\n\u003cli\u003eBall joint mounting type is welded with a threaded stud (ball joint not included)\u003c\/li\u003e\n\u003cli\u003eOverall length of 262.5 mm suitable for specific BMW models\u003c\/li\u003e\n\u003cli\u003ePress-in end type with bushing linkage end\u003c\/li\u003e\n\u003cli\u003eMounting hardware and grease fitting are not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThis Dorman suspension control arm (part number 521-339) is designed to restore proper suspension geometry and improve ride quality on compatible BMW vehicles. The steel construction combines casting and forging techniques to provide strength and durability under normal driving conditions. The black coated finish helps protect against rust and corrosion, extending the service life of the control arm.\u003c\/p\u003e\u003cp\u003eThe control arm features a rubber bushing that cushions suspension movement and reduces noise and vibration. The bushing’s dimensions are engineered to fit precisely, ensuring proper alignment and smooth articulation. The welded ball joint mounting type with a threaded stud allows for secure attachment of the ball joint, although the ball joint itself is not included with this part.\u003c\/p\u003e\u003ch2\u003eCompatible BMW Models\u003c\/h2\u003e\u003cp\u003eThis control arm is compatible with a range of BMW models including the 120i, 125i, 128i, 130i, 135i, 135is, 323i, 325i, 325xi, 328i, 328i xDrive, 328xi, 330i, 330xi, 335d, 335i, 335is, 335i xDrive, and 335xi. It is designed to meet the suspension requirements of these vehicles, 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 uneven tire wear\u003c\/li\u003e\n\u003cli\u003eLoose or noisy suspension components affecting ride comfort\u003c\/li\u003e\n\u003cli\u003eMisalignment leading to poor handling and steering response\u003c\/li\u003e\n\u003cli\u003eCorroded or weakened control arms compromising suspension integrity\u003c\/li\u003e\n\u003cli\u003eVibration or clunking noises during acceleration or braking\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure vehicle is securely lifted and supported before installation\u003c\/li\u003e\n\u003cli\u003eRemove old control arm and inspect ball joint and mounting points\u003c\/li\u003e\n\u003cli\u003eUse appropriate tools to press out old bushings if necessary\u003c\/li\u003e\n\u003cli\u003eVerify correct orientation and fitment of the new control arm (part number 521-339)\u003c\/li\u003e\n\u003cli\u003eTorque all fasteners to manufacturer specifications\u003c\/li\u003e\n\u003cli\u003eWheel alignment is recommended after installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman suspension control arms are manufactured to meet or exceed OEM standards for fit, form, and function. The 521-339 control arm undergoes quality inspections to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in materials and workmanship.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43997103128757,"sku":"BKKY-521-339","price":45.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/RB_521339_Fro_42858576-0664-4bf5-81db-d7d1d8b262c9.jpg?v=1775007842","url":"https:\/\/www.partcatalog.com\/products\/dorman-521-339-suspension-control-arm","provider":"PartCatalog","version":"1.0","type":"link"}