{"product_id":"dorman-m390401-brake-master-cylinder","title":"Dorman M390401 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Buick, Chevrolet, Oldsmobile, and Pontiac\u003c\/h2\u003e\u003cp\u003eThe Dorman M390401 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Buick, Chevrolet, Oldsmobile, and Pontiac models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 1 inch for accurate fluid displacement\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum material for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir and sensor for complete brake system integration\u003c\/li\u003e\n\u003cli\u003eTwo outlets with M12 x 1.0 thread size for secure hydraulic connections\u003c\/li\u003e\n\u003cli\u003eCompatible with Buick Allure, Chevrolet Impala, Monte Carlo, Oldsmobile Intrigue, Pontiac Grand Prix, and other models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Features and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M390401 master cylinder features a 1-inch bore diameter, which is critical for maintaining the correct hydraulic pressure within the brake system. Its aluminum construction offers strength and resistance to corrosion, extending the service life of the component. This unit comes complete with a reservoir and sensor, allowing for seamless integration with the vehicle’s brake fluid monitoring system. The two outlets, both sized M12 x 1.0 with a 1.0 thread pitch, provide reliable connections to the brake lines, ensuring leak-free operation.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is compatible with a range of GM vehicles, including Buick Allure and LaCrosse, Chevrolet Century, Impala, Montana, and Monte Carlo, Oldsmobile Intrigue and Silhouette, as well as Pontiac Grand Prix and Regal. The part number M390401 is specifically designed to meet the hydraulic requirements of these models, making it a suitable replacement for worn or damaged master cylinders in these vehicles.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by This Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal sinking or sponginess due to internal leaks\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks around the master cylinder or reservoir\u003c\/li\u003e\n\u003cli\u003eInconsistent brake pressure causing uneven braking\u003c\/li\u003e\n\u003cli\u003eWarning lights triggered by faulty brake fluid sensors\u003c\/li\u003e\n\u003cli\u003eReduced braking performance from worn or damaged master cylinder components\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M390401 master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic function. Note that mounting hardware is not included, so retain original fasteners or acquire appropriate replacements. Verify thread sizes (M12 x 1.0) for brake line fittings to ensure compatibility. It is recommended to inspect related brake components during installation for overall system integrity.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman manufactures this brake master cylinder to meet or exceed OEM specifications, using quality aluminum materials and precise machining. The included sensor and reservoir are tested for reliable operation within the brake system. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship to provide confidence in product durability.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792164257973,"sku":"BKKX-M390401","price":99.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390401_Fro_e1d9736c-7d07-4e8a-a18c-2f8664bac9da.jpg?v=1774997583","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390401-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}