{"product_id":"dorman-m390139-brake-master-cylinder","title":"Dorman M390139 Brake Master Cylinder","description":"\u003ch2\u003eOverview of Dorman Brake Master Cylinder M390139\u003c\/h2\u003e\u003cp\u003eThe Dorman Brake Master Cylinder M390139 is designed specifically for Nissan Altima and Infiniti G20 models. This brake hydraulics component features an aluminum construction and includes a reservoir and sensor to ensure reliable brake system performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Nissan Altima and Infiniti G20\u003c\/li\u003e\n\u003cli\u003eMaster cylinder bore diameter: 0.938 inches\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum material\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir and sensor for integrated functionality\u003c\/li\u003e\n\u003cli\u003eFour outlets with secondary outlet thread diameter of 10 mm\u003c\/li\u003e\n\u003cli\u003eRearward outlet size: M10 x 1.0 with 1.0 thread pitch\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 M390139 brake master cylinder is engineered to meet the specifications required for proper brake hydraulics operation in Nissan Altima and Infiniti G20 vehicles. Its aluminum body offers corrosion resistance and strength, while the 0.938-inch bore diameter ensures consistent hydraulic pressure. The included reservoir allows for fluid storage, and the integrated sensor provides feedback for brake system monitoring. With four outlets and precise thread dimensions, this master cylinder supports efficient brake fluid distribution to the vehicle’s braking system.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is used to replace worn or failing units in compatible Nissan and Infiniti models. It addresses several brake system issues, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal sinking or sponginess\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from the master cylinder\u003c\/li\u003e\n\u003cli\u003eInconsistent brake pressure or poor braking response\u003c\/li\u003e\n\u003cli\u003eWarning light activation due to sensor failure\u003c\/li\u003e\n\u003cli\u003eReservoir damage or fluid contamination\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M390139 master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Note that mounting hardware is not included, so existing hardware should be inspected and replaced if necessary. Verify thread pitch and outlet sizes to ensure compatibility with the vehicle’s brake lines. Sensor connections should be securely attached to maintain accurate brake system monitoring.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term durability. While specific warranty details should be confirmed at the time of purchase, Dorman typically offers limited warranties covering defects in materials and workmanship.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792106324149,"sku":"BKKX-M390139","price":110.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390139_Fro.jpg?v=1774997550","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390139-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}