{"product_id":"dorman-m39405-brake-master-cylinder","title":"Dorman M39405 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for BMW 320i and 325e\u003c\/h2\u003e\u003cp\u003eThe Dorman M39405 brake master cylinder is engineered to meet the hydraulic braking needs of BMW 320i and 325e models. Designed with precision, this cast iron master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 0.813 inches for accurate hydraulic control\u003c\/li\u003e\n\u003cli\u003eConstructed from durable cast iron material for long-lasting strength\u003c\/li\u003e\n\u003cli\u003eIncludes four outlets with a rearward outlet size of M10 x 1.0 and a thread pitch of 1.0\u003c\/li\u003e\n\u003cli\u003eSecondary outlet thread diameter measures 10 mm\u003c\/li\u003e\n\u003cli\u003ePackage contains the master cylinder only; mounting hardware and reservoir are not included\u003c\/li\u003e\n\u003cli\u003eNo sensor included, designed for direct replacement applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Compatibility\u003c\/h2\u003e\u003cp\u003eThe Dorman M39405 brake master cylinder is specifically compatible with BMW 320i and 325e vehicles, providing a direct fit replacement for the original component. Its 0.813-inch bore diameter is calibrated to maintain proper hydraulic pressure within the brake system. Manufactured from cast iron, this master cylinder offers durability and resistance to wear under demanding braking conditions. The unit features four outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, ensuring secure connections to brake lines. Note that this product does not include a reservoir or mounting hardware, so these components must be sourced separately if needed.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake fluid pressure in BMW 320i and 325e hydraulic systems\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders causing brake pedal issues\u003c\/li\u003e\n\u003cli\u003eAddresses brake fluid leaks from damaged or corroded master cylinders\u003c\/li\u003e\n\u003cli\u003eImproves brake responsiveness and pedal feel in affected vehicles\u003c\/li\u003e\n\u003cli\u003eSuitable for maintenance or repair of brake hydraulics on compatible BMW models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M39405 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic function. Since mounting hardware and reservoir are not included, verify the condition of existing components before installation. Use appropriate tools to secure the master cylinder outlets with the specified M10 x 1.0 thread pitch fittings. It is recommended to consult the vehicle’s service manual for torque specifications and detailed installation procedures to maintain safety and performance standards.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M39405 brake master cylinder to meet industry standards for brake hydraulics. The cast iron construction provides reliable durability under normal operating conditions. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship. For exact warranty terms, refer to the product documentation or contact the manufacturer directly.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43789336215733,"sku":"BKKX-M39405","price":97.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M39405_Fro.jpg?v=1774997468","url":"https:\/\/www.partcatalog.com\/products\/dorman-m39405-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}