{"product_id":"dorman-m630440-brake-master-cylinder","title":"Dorman M630440 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Buick, Chevrolet, GMC, and Saab\u003c\/h2\u003e\u003cp\u003eThe Dorman M630440 Brake Master Cylinder is engineered to restore proper brake hydraulics for select Buick, Chevrolet, GMC, and Saab models. Designed with precision, this master cylinder includes a reservoir and sensor to ensure optimal brake system performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 1.063 inches for accurate hydraulic pressure\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 secondary outlet thread diameter of 0.5 inches\u003c\/li\u003e\n\u003cli\u003eRearward outlet size: 1\/2-20 for secure brake line connections\u003c\/li\u003e\n\u003cli\u003eCompatible with Buick 9-7x, Chevrolet Trailblazer, Trailblazer EXT, GMC Envoy, Envoy XL, Rainier, and Saab 9-7x\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M630440 master cylinder is designed to meet the exact specifications required for brake hydraulics in multiple GM and Saab SUVs. Its aluminum construction provides strength and resistance to wear, while the included reservoir and sensor ensure the brake fluid is properly monitored and maintained. The 1.063-inch bore diameter supports consistent hydraulic pressure, critical for safe braking performance. Featuring two outlets, including a rearward outlet sized at 1\/2-20, this master cylinder facilitates secure and reliable brake line connections.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is compatible with the following vehicles:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuick 9-7x\u003c\/li\u003e\n\u003cli\u003eChevrolet Trailblazer and Trailblazer EXT\u003c\/li\u003e\n\u003cli\u003eGMC Envoy, Envoy XL, and Rainier\u003c\/li\u003e\n\u003cli\u003eSaab 9-7x\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIt is designed specifically for brake hydraulic systems requiring a master cylinder with the listed bore diameter and outlet specifications.\u003c\/p\u003e\u003ch2\u003eCommon Brake System Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal sinking or sponginess due to master cylinder failure\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from worn or damaged master cylinder seals\u003c\/li\u003e\n\u003cli\u003eInconsistent brake pressure affecting stopping performance\u003c\/li\u003e\n\u003cli\u003eWarning lights triggered by faulty brake fluid level sensors\u003c\/li\u003e\n\u003cli\u003eBrake system contamination from reservoir damage or cracks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M630440 master cylinder requires careful attention to brake fluid handling and bleeding procedures. Note that mounting hardware is not included and must be reused or sourced separately. Ensure all brake lines are properly connected to the two outlets, including the rearward outlet sized 1\/2-20. Verify sensor connections for accurate brake fluid level monitoring. After installation, perform a thorough brake bleed to remove air from the system and confirm proper pedal feel.\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 reliability. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulic components. Consult product documentation or the manufacturer for exact warranty terms.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792271769781,"sku":"BKKX-M630440","price":129.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M630440_Fro.jpg?v=1774997680","url":"https:\/\/www.partcatalog.com\/products\/dorman-m630440-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}