{"product_id":"dorman-m390127-brake-master-cylinder","title":"Dorman M390127 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Buick, Cadillac, and Chevrolet\u003c\/h2\u003e\u003cp\u003eThe Dorman M390127 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Buick, Cadillac, and Chevrolet models. Designed with an aluminum body and an included reservoir, this master cylinder ensures consistent brake fluid delivery for safe and effective braking performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConstructed from durable aluminum for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid containment\u003c\/li\u003e\n\u003cli\u003eCompatible with Buick Caprice, Cadillac Fleetwood, and Chevrolet Roadmaster\u003c\/li\u003e\n\u003cli\u003eFeatures dual outlets with precise thread specifications (M11 x 1.5 rearward outlet, M12 x 1.0 secondary outlet)\u003c\/li\u003e\n\u003cli\u003eMaster cylinder bore diameter of 40 mm \u0026amp; 1-1\/8 inch for accurate hydraulic pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M390127 master cylinder is designed to meet the exacting requirements of brake hydraulics systems in full-size luxury and performance vehicles such as the Buick Caprice, Cadillac Fleetwood, and Chevrolet Roadmaster. Its aluminum construction provides strength and resistance to corrosion, extending the service life of the component. The included reservoir simplifies installation by providing a ready-to-use brake fluid container. This master cylinder features two outlets, with a rearward outlet sized M11 x 1.5 and a secondary outlet thread diameter of M12 x 1.0, ensuring compatibility with the vehicle’s brake lines. The bore diameter of 40 mm (1-1\/8 inch) is engineered to deliver consistent hydraulic pressure for reliable braking response.\u003c\/p\u003e\u003ch2\u003eApplications and Common Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake fluid pressure in Buick Caprice brake systems\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders in Cadillac Fleetwood models\u003c\/li\u003e\n\u003cli\u003eEliminates spongy or unresponsive brake pedal feel in Chevrolet Roadmaster vehicles\u003c\/li\u003e\n\u003cli\u003ePrevents brake fluid leaks that can lead to reduced braking efficiency\u003c\/li\u003e\n\u003cli\u003eAddresses master cylinder failure symptoms such as brake warning lights or pedal sinking\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the Dorman M390127 master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. The included reservoir should be filled with the manufacturer-recommended brake fluid before installation. Verify thread sizes (M11 x 1.5 rearward outlet and M12 x 1.0 secondary outlet) match the vehicle’s brake line fittings to avoid leaks. Although mounting hardware is not included, the unit is designed to fit directly into the original mounting points on compatible Buick, Cadillac, and Chevrolet models.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures this brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and precise machining contribute to long-term durability. While specific warranty details are not provided here, Dorman products typically come with 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":52089072943285,"sku":"BKKX-M390127","price":155.79,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390127_Fro.jpg?v=1775148234","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390127-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}