{"product_id":"dorman-m390509-brake-master-cylinder","title":"Dorman M390509 Brake Master Cylinder","description":"\u003ch2\u003eOverview of Dorman Brake Master Cylinder M390509\u003c\/h2\u003e\u003cp\u003eThe Dorman Brake Master Cylinder M390509 is designed specifically for Subaru Impreza and Legacy models, providing reliable brake hydraulics performance. This master cylinder features an aluminum construction and includes a reservoir and sensor to ensure proper brake system function.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Subaru Impreza and Legacy models\u003c\/li\u003e\n\u003cli\u003eMaster cylinder bore diameter of 0.938 inches\u003c\/li\u003e\n\u003cli\u003eDurable aluminum master cylinder material\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir and sensor for accurate brake fluid management\u003c\/li\u003e\n\u003cli\u003eFour outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0\u003c\/li\u003e\n\u003cli\u003eSecondary outlet thread diameter of 10 mm\u003c\/li\u003e\n\u003cli\u003eMounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman M390509 brake master cylinder is engineered to meet the hydraulic requirements of Subaru Impreza and Legacy vehicles. Constructed from aluminum, this master cylinder offers corrosion resistance and strength for long-term durability. The included reservoir allows for proper brake fluid storage, while the integrated sensor monitors fluid levels to maintain system safety. With a bore diameter of 0.938 inches and four outlets, including a rearward outlet sized M10 x 1.0, this master cylinder supports efficient brake fluid distribution. The thread pitch of 1.0 ensures secure connections with compatible brake lines. Note that mounting hardware is not included and must be sourced separately.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores proper brake fluid pressure in Subaru Impreza and Legacy brake systems\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders causing brake pedal sponginess\u003c\/li\u003e\n\u003cli\u003eResolves brake fluid leaks from damaged or corroded master cylinders\u003c\/li\u003e\n\u003cli\u003eAddresses sensor failures related to brake fluid level monitoring\u003c\/li\u003e\n\u003cli\u003eImproves brake system responsiveness and safety\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure compatibility with specific Subaru Impreza or Legacy model year before installation\u003c\/li\u003e\n\u003cli\u003eBleed the brake system thoroughly after installation to remove air pockets\u003c\/li\u003e\n\u003cli\u003eUse appropriate brake fluid as specified by the vehicle manufacturer\u003c\/li\u003e\n\u003cli\u003eVerify sensor connections are secure for accurate fluid level monitoring\u003c\/li\u003e\n\u003cli\u003eMounting hardware is not included; reuse existing hardware or obtain correct replacements\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M390509 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. While specific warranty details are not provided here, Dorman products typically include a limited warranty 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":43792175300789,"sku":"BKKX-M390509","price":143.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390509_Fro_31c96abd-793c-42f3-b69a-9b09ceed4607.jpg?v=1774997592","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390509-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}