{"product_id":"dorman-m66712-brake-master-cylinder","title":"Dorman M66712 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Classic GM Vehicles\u003c\/h2\u003e\u003cp\u003eThe Dorman M66712 brake master cylinder is engineered to restore proper brake hydraulics in select Buick, Cadillac, Oldsmobile, and Pontiac models. Designed with durable cast iron and a built-in reservoir, this master cylinder ensures consistent brake fluid delivery for safe stopping performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 1 inch\u003c\/li\u003e\n\u003cli\u003eConstructed from cast iron for durability\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid\u003c\/li\u003e\n\u003cli\u003eTwo outlets with rearward outlet size of 9\/16-18\u003c\/li\u003e\n\u003cli\u003eSecondary outlet thread diameter: 0.5 inch\u003c\/li\u003e\n\u003cli\u003eMounting hardware not included\u003c\/li\u003e\n\u003cli\u003ePart number: M66712\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDurable Construction and Precise Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M66712 brake master cylinder features a 1-inch bore diameter made from cast iron, providing strength and resistance to wear. Its integrated reservoir simplifies brake fluid management, while the two outlets—including a rearward outlet sized at 9\/16-18 and a secondary outlet with 0.5-inch thread diameter—allow for proper brake line connections. This master cylinder is designed specifically for classic GM vehicles such as the Buick LeSabre and Riviera, Cadillac DeVille and Eldorado, Oldsmobile Delta 88 and 98, and Pontiac Bonneville and Grand Prix, ensuring compatibility and reliable performance.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is compatible with a range of Buick, Cadillac, Oldsmobile, and Pontiac models, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuick 98, LeSabre, Riviera\u003c\/li\u003e\n\u003cli\u003eCadillac DeVille, Eldorado, Fleetwood\u003c\/li\u003e\n\u003cli\u003eOldsmobile Delta 88, 98\u003c\/li\u003e\n\u003cli\u003ePontiac Bonneville, Catalina, Grand Prix, Toronado\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIt is ideal for restoring brake hydraulics in these vehicles, especially when experiencing issues related to brake fluid pressure and pedal feel.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by This Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSpongy or soft brake pedal response\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from the master cylinder reservoir\u003c\/li\u003e\n\u003cli\u003eReduced braking efficiency or uneven brake pressure\u003c\/li\u003e\n\u003cli\u003eBrake warning light activation due to hydraulic failure\u003c\/li\u003e\n\u003cli\u003eBrake pedal sinking or failure to maintain pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M66712 master cylinder requires proper brake line connection to the two outlets, matching the specified thread sizes. Since mounting hardware is not included, ensure you have the correct bolts and fittings for your vehicle. Bleeding the brake system thoroughly after installation is essential to remove air and restore full braking function. Professional installation is recommended for safety and optimal performance.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures this brake master cylinder to meet or exceed OEM specifications, using cast iron for long-lasting durability. While mounting hardware is not included, the product undergoes quality checks to ensure fitment and function. Please refer to Dorman's warranty policy for coverage details on the M66712 part.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43789376749749,"sku":"BKKX-M66712","price":84.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M66712_Fro.jpg?v=1774997519","url":"https:\/\/www.partcatalog.com\/products\/dorman-m66712-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}