{"product_id":"dorman-m39580-brake-master-cylinder","title":"Dorman M39580 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Buick, Cadillac, Oldsmobile, and Pontiac\u003c\/h2\u003e\u003cp\u003eThe Dorman M39580 brake master cylinder is engineered to restore proper brake hydraulics in select Buick, Cadillac, Oldsmobile, and Pontiac models. Designed with precision, this aluminum master cylinder includes a reservoir and features dual bore diameters to meet specific braking system requirements.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Buick 98, Bonneville, Custom Cruiser, Delta 88, LeSabre\u003c\/li\u003e\n\u003cli\u003eFits Cadillac DeVille and Fleetwood models\u003c\/li\u003e\n\u003cli\u003eAluminum construction for durability and corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for fluid storage\u003c\/li\u003e\n\u003cli\u003eDual master cylinder bore diameters: 24mm and 36mm\u003c\/li\u003e\n\u003cli\u003eFour outlet ports with rearward outlet sizes M11 x 1.5 and M16 x 1.5\u003c\/li\u003e\n\u003cli\u003ePart number M39580 for accurate identification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M39580 brake master cylinder is crafted from aluminum, providing a lightweight yet durable component essential for brake hydraulics. It features two bore diameters, 24mm and 36mm, to accommodate the specific brake system design of various GM vehicles. The included reservoir ensures proper brake fluid containment, while the four outlet ports with rearward outlet thread diameters of M11 x 1.5 and M16 x 1.5 allow for secure brake line connections. This master cylinder does not include mounting hardware or sensors, focusing on core hydraulic functionality.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake pressure in Buick 98 and Pontiac Bonneville models\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders in Cadillac DeVille and Fleetwood\u003c\/li\u003e\n\u003cli\u003eAddresses brake fluid leaks and loss of hydraulic pressure\u003c\/li\u003e\n\u003cli\u003eSolves spongy or unresponsive brake pedal issues\u003c\/li\u003e\n\u003cli\u003ePrevents brake system failure due to master cylinder wear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M39580 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal performance. Since mounting hardware is not included, retain original fasteners or source compatible replacements. Verify outlet thread sizes (M11 x 1.5 and M16 x 1.5) to match brake lines. This part is designed for direct replacement on compatible Buick, Cadillac, Oldsmobile, and Pontiac models listed.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman brake master cylinders undergo rigorous testing to meet OEM standards for fit, form, and function. The M39580 part is backed by Dorman's limited warranty, covering defects in material and workmanship to provide confidence in long-term reliability.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43789345226933,"sku":"BKKX-M39580","price":77.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M39580_Fro.jpg?v=1774997484","url":"https:\/\/www.partcatalog.com\/products\/dorman-m39580-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}