{"product_id":"dorman-m630838-brake-master-cylinder","title":"Dorman M630838 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for BMW 1 Series M and M3\u003c\/h2\u003e\u003cp\u003eThe Dorman M630838 brake master cylinder is engineered to restore proper brake hydraulics in select BMW models. Designed specifically for the BMW 1 Series M and M3, this aluminum master cylinder offers precise bore dimensions and dual outlet ports to maintain optimal braking performance.\u003c\/p\u003e\u003ch2\u003eKey Features of the Dorman M630838 Brake Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 0.875 inches for accurate hydraulic pressure\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum material for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes two outlets with M12 x 1.0 thread size for rearward and secondary connections\u003c\/li\u003e\n\u003cli\u003eDoes not include reservoir or sensor, designed for direct replacement\u003c\/li\u003e\n\u003cli\u003ePackage contains the master cylinder only, no mounting hardware included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman M630838 brake master cylinder is a direct replacement part tailored for BMW 1 Series M and M3 vehicles. Its 0.875-inch bore diameter ensures consistent hydraulic pressure delivery, critical for effective brake system operation. Manufactured from aluminum, this master cylinder resists corrosion and wear, contributing to long-term reliability. Featuring two outlets with M12 x 1.0 thread pitch, it supports proper brake line connections for both primary and secondary circuits. This part does not include a reservoir or sensor, making it suitable for applications where the original components remain intact.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake hydraulic pressure in BMW 1 Series M and M3 models\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders causing brake fluid loss\u003c\/li\u003e\n\u003cli\u003eEliminates spongy or unresponsive brake pedal feel\u003c\/li\u003e\n\u003cli\u003eAddresses brake system failure due to internal cylinder wear\u003c\/li\u003e\n\u003cli\u003eSupports maintenance of brake system integrity without reservoir replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure compatibility with BMW 1 Series M and M3 before installation\u003c\/li\u003e\n\u003cli\u003eBleed brake system thoroughly after installation to remove air\u003c\/li\u003e\n\u003cli\u003eUse appropriate brake fluid as specified by vehicle manufacturer\u003c\/li\u003e\n\u003cli\u003eCheck all brake line connections for proper fit on M12 x 1.0 outlets\u003c\/li\u003e\n\u003cli\u003eVerify absence of leaks and proper pedal feel before driving\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M630838 brake master cylinder to meet or exceed OEM specifications for fit and function. While no mounting hardware or sensors are included, the part is designed for reliable performance in BMW brake hydraulic systems. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":52156290367669,"sku":"BKKX-M630838","price":156.03,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M630838_Fro.jpg?v=1775497084","url":"https:\/\/www.partcatalog.com\/products\/dorman-m630838-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}