{"product_id":"dorman-m390258-brake-master-cylinder","title":"Dorman M390258 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Dodge Ram 2500 and 3500\u003c\/h2\u003e\u003cp\u003eThe Dorman M390258 Brake Master Cylinder is engineered to restore proper brake function in Dodge Ram 2500 and Ram 3500 trucks. Designed with durable aluminum construction and a built-in reservoir, this master cylinder ensures consistent hydraulic pressure for safe braking performance.\u003c\/p\u003e\u003ch2\u003eKey Features of the Dorman M390258 Brake Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter of 1.25 inches for precise hydraulic control\u003c\/li\u003e\n\u003cli\u003eConstructed from lightweight, corrosion-resistant aluminum material\u003c\/li\u003e\n\u003cli\u003eIncludes an integrated reservoir for brake fluid storage\u003c\/li\u003e\n\u003cli\u003eEquipped with two outlets to support dual-circuit brake systems\u003c\/li\u003e\n\u003cli\u003eRearward outlet size: 1\/2-20 thread for secure brake line connection\u003c\/li\u003e\n\u003cli\u003eSecondary outlet thread diameter: 9\/16-18 for compatibility with factory brake lines\u003c\/li\u003e\n\u003cli\u003ePackage contains the master cylinder unit only; mounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description and Specifications\u003c\/h2\u003e\u003cp\u003eThis Dorman brake master cylinder (part number M390258) is specifically designed for use in Dodge Ram 2500 and Ram 3500 models, providing a direct replacement for the original equipment. The 1.25-inch bore diameter allows for accurate brake fluid displacement, which is critical for maintaining proper brake pedal feel and stopping power. The aluminum construction offers resistance to corrosion and heat, extending the service life of the component. The included reservoir simplifies installation and maintenance by housing the brake fluid in a sealed, integrated unit. With two outlets featuring standard thread sizes (1\/2-20 rearward and 9\/16-18 secondary), this master cylinder supports dual-circuit brake systems commonly found in heavy-duty trucks.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake pressure in Dodge Ram 2500 and 3500 trucks experiencing soft or spongy brake pedal feel\u003c\/li\u003e\n\u003cli\u003eReplaces leaking or damaged master cylinders causing brake fluid loss\u003c\/li\u003e\n\u003cli\u003eAddresses brake system failure due to worn internal seals or corrosion\u003c\/li\u003e\n\u003cli\u003eImproves brake responsiveness in trucks with inconsistent stopping performance\u003c\/li\u003e\n\u003cli\u003eServes as a direct replacement for OEM master cylinders in compatible Dodge Ram models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure brake fluid reservoir is properly filled and free of contaminants before installation\u003c\/li\u003e\n\u003cli\u003eBleed the brake system thoroughly after installation to remove air and restore hydraulic pressure\u003c\/li\u003e\n\u003cli\u003eVerify thread sizes (1\/2-20 rearward and 9\/16-18 secondary) match existing brake lines for proper fitment\u003c\/li\u003e\n\u003cli\u003eUse appropriate tools to avoid damaging aluminum surfaces during installation\u003c\/li\u003e\n\u003cli\u003eMounting hardware is not included; reuse original hardware or source compatible fasteners\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M390258 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated reservoir are designed for durability under demanding conditions typical of Dodge Ram 2500 and 3500 trucks. While mounting hardware is not included, the product undergoes quality checks to ensure reliable performance. Warranty coverage details should be confirmed through the original product documentation or Dorman's official resources.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792139124917,"sku":"BKKX-M390258","price":97.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390258_Fro.jpg?v=1774997562","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390258-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}