{"product_id":"dorman-m630405-brake-master-cylinder","title":"Dorman M630405 Brake Master Cylinder","description":"\u003ch2\u003eBrake Master Cylinder for 2008 Cadillac CTS and STS\u003c\/h2\u003e\u003cp\u003eDorman M630405 is a brake master cylinder built for specific 2008 Cadillac applications, including the CTS and STS. It is engineered to match the original unit’s design, function, and performance, with new materials selected for durable brake system service.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDirect replacement brake master cylinder for select 2008 Cadillac CTS and 2008 Cadillac STS applications\u003c\/li\u003e\n\u003cli\u003e1.031-inch bore diameter for the listed fitments\u003c\/li\u003e\n\u003cli\u003eAluminum master cylinder construction\u003c\/li\u003e\n\u003cli\u003eReservoir included\u003c\/li\u003e\n\u003cli\u003eSensor included\u003c\/li\u003e\n\u003cli\u003eTwo outlets with M13 x 1.5 thread size\u003c\/li\u003e\n\u003cli\u003ePart number M630405\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eThis Dorman brake master cylinder is designed for vehicles that require a 1.0313-inch bore size, including the 2008 Cadillac CTS and 2008 Cadillac STS with Active Steering Control. The aluminum body and included reservoir help support a clean OE-style replacement for the original hydraulic brake assembly. Dorman M630405 is also cross-referenced to Monroe Shocks \u0026amp; Struts 172286 for the same application.\u003c\/p\u003e\u003cp\u003eUse this brake master cylinder when replacing a worn, leaking, or internally bypassing unit on the 2008 Cadillac CTS or 2008 Cadillac STS. The sensor and dual outlet configuration support proper integration with the vehicle’s brake hydraulic system, while the matched bore size helps maintain original pedal and braking characteristics.\u003c\/p\u003e\u003ch2\u003eCommon Problems This Part Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal sinking or gradual pedal drop\u003c\/li\u003e\n\u003cli\u003eExternal brake fluid leakage at the master cylinder\u003c\/li\u003e\n\u003cli\u003eInternal bypass causing inconsistent hydraulic pressure\u003c\/li\u003e\n\u003cli\u003eBrake warning light concerns related to master cylinder sensor issues\u003c\/li\u003e\n\u003cli\u003eLoss of braking performance from a worn hydraulic unit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify bore size, outlet thread size, and vehicle configuration before installation. This part does not include mounting hardware. After installation, bleed the brake system thoroughly and confirm there are no fluid leaks at the outlets, reservoir, or line connections. For the listed 2008 Cadillac STS application, confirm Active Steering Control and bore specification match the vehicle.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eDorman manufactures this replacement master cylinder using new, high-quality materials and designs it to match the original part’s function and performance on the specified vehicles. Part number M630405 is built for direct-fit service on the listed Cadillac applications.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":52431298429109,"sku":"BKKX-M630405","price":114.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M630405_Fro.jpg?v=1777853378","url":"https:\/\/www.partcatalog.com\/products\/dorman-m630405-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}