{"product_id":"dorman-m390391-brake-master-cylinder","title":"Dorman M390391 Brake Master Cylinder","description":"\u003ch2\u003eOverview of Dorman Brake Master Cylinder for Ford E-350 Econoline\u003c\/h2\u003e\u003cp\u003eThe Dorman M390391 brake master cylinder is designed specifically for Ford E-350 Econoline models, providing reliable brake hydraulics performance. This master cylinder features an aluminum construction and includes a reservoir and sensor to ensure proper brake fluid management and system monitoring.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 1.25 inches\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum material\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir and sensor for brake fluid level monitoring\u003c\/li\u003e\n\u003cli\u003eTwo outlet ports with rearward outlet size 7\/16-24 and secondary outlet thread diameter 9\/16-18\u003c\/li\u003e\n\u003cli\u003ePackage contains the master cylinder only; mounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman M390391 brake master cylinder is engineered to meet the hydraulic braking needs of Ford E-350 Econoline vehicles. Its 1.25-inch bore diameter ensures proper fluid displacement for effective brake pressure. Made from aluminum, this master cylinder offers corrosion resistance and long service life. The included reservoir allows for adequate brake fluid storage, while the integrated sensor provides real-time fluid level feedback to the vehicle’s monitoring system. Featuring two outlets, the master cylinder supports dual-circuit brake systems, with precise outlet thread sizes of 7\/16-24 for the rearward outlet and 9\/16-18 for the secondary outlet, ensuring compatibility with factory brake lines.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores proper brake fluid pressure in Ford E-350 Econoline brake systems\u003c\/li\u003e\n\u003cli\u003eReplaces leaking or damaged master cylinders causing brake fluid loss\u003c\/li\u003e\n\u003cli\u003eResolves brake pedal sinking or sponginess due to internal seal failure\u003c\/li\u003e\n\u003cli\u003eAddresses brake warning light activation related to fluid level sensor faults\u003c\/li\u003e\n\u003cli\u003eImproves overall brake system responsiveness and safety\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M390391 brake master cylinder requires careful attention to brake fluid handling and bleeding procedures. Since mounting hardware is not included, retain original fasteners or source compatible replacements. Ensure all brake lines are properly connected to the correct outlet ports based on thread size. After installation, thoroughly bleed the brake system to remove air and verify sensor functionality. Professional installation is recommended for accurate fitment and safety compliance.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M390391 brake master cylinder to meet or exceed OEM specifications for Ford E-350 Econoline vehicles. The aluminum construction and integrated sensor contribute to reliable performance under normal operating conditions. While specific warranty details are not provided here, Dorman typically offers limited warranties covering defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792161145013,"sku":"BKKX-M390391","price":105.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390391_Fro.jpg?v=1774997581","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390391-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}