{"product_id":"dorman-m630940-brake-master-cylinder","title":"Dorman M630940 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Hyundai and Kia Vehicles\u003c\/h2\u003e\u003cp\u003eThe Dorman M630940 brake master cylinder is engineered to restore proper brake hydraulics in select Hyundai and Kia models. Designed with durable cast iron and equipped with a removable reservoir, this master cylinder ensures consistent braking performance for your Optima or Sonata.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 0.9375 inches for precise hydraulic pressure\u003c\/li\u003e\n\u003cli\u003eConstructed from cast iron for long-lasting durability\u003c\/li\u003e\n\u003cli\u003eIncludes a removable reservoir for easy maintenance\u003c\/li\u003e\n\u003cli\u003eEquipped with a sensor to monitor brake fluid levels\u003c\/li\u003e\n\u003cli\u003eTwo outlets with M12 x 1.0 thread size for secure connections\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDurable Construction and Functional Design\u003c\/h2\u003e\u003cp\u003eThis Dorman brake master cylinder (part number M630940) features a cast iron body that withstands the rigors of daily driving and brake system pressure. The 0.9375-inch bore diameter is calibrated to deliver accurate hydraulic force to the brake calipers. The included removable reservoir simplifies fluid checks and refills, while the integrated sensor provides real-time monitoring of brake fluid levels to help maintain safety. With two outlets threaded M12 x 1.0, this master cylinder ensures compatibility with the brake lines on Hyundai Optima and Kia Sonata models.\u003c\/p\u003e\u003ch2\u003eCompatible Hyundai and Kia Models\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is specifically designed for use in Hyundai Optima and Kia Sonata vehicles, providing a direct replacement for the original part. Using the Dorman M630940 ensures proper fitment and reliable brake system operation in these models.\u003c\/p\u003e\u003ch2\u003eCommon Brake System Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal feels spongy or sinks to the floor\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from the master cylinder or reservoir\u003c\/li\u003e\n\u003cli\u003eWarning light triggered by low brake fluid sensor\u003c\/li\u003e\n\u003cli\u003eReduced braking efficiency or inconsistent brake pressure\u003c\/li\u003e\n\u003cli\u003eCorroded or damaged master cylinder body affecting performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M630940 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic pressure. The removable reservoir allows for easier fluid handling during installation. Verify that the sensor connector is securely attached to maintain brake fluid level monitoring. This part does not include mounting hardware, so retain original fasteners or source replacements as needed.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman brake master cylinders are manufactured to meet or exceed OEM specifications, providing reliable performance and durability. The M630940 part is backed by Dorman's quality standards, ensuring a dependable replacement for your Hyundai Optima or Kia Sonata brake system. Please refer to Dorman's warranty policy for specific coverage details.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":52089080414389,"sku":"BKKX-M630940","price":133.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M630940_Fro.jpg?v=1775148262","url":"https:\/\/www.partcatalog.com\/products\/dorman-m630940-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}