{"product_id":"dorman-m630139-brake-master-cylinder","title":"Dorman M630139 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Lexus RX300\u003c\/h2\u003e\u003cp\u003eThe Dorman M630139 brake master cylinder is engineered to restore proper brake hydraulics for your Lexus RX300. Designed with durable aluminum construction and precise specifications, this master cylinder ensures consistent brake performance and safety.\u003c\/p\u003e\u003ch2\u003eKey Features of Dorman M630139 Brake Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eConstructed from lightweight, corrosion-resistant aluminum\u003c\/li\u003e\n\u003cli\u003eMaster cylinder bore diameter of 1 inch for accurate hydraulic pressure\u003c\/li\u003e\n\u003cli\u003eTwo outlet ports with rearward outlet size M10 x 1.0 thread pitch\u003c\/li\u003e\n\u003cli\u003eIncludes master cylinder only; reservoir and mounting hardware not included\u003c\/li\u003e\n\u003cli\u003eCompatible specifically with Lexus RX300 brake hydraulic systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman M630139 brake master cylinder is designed to meet the exact hydraulic requirements of the Lexus RX300. Featuring a 1-inch bore diameter, this aluminum master cylinder provides reliable pressure delivery to the brake system. It includes two outlets with a secondary outlet thread diameter of 10 mm and a rearward outlet size of M10 x 1.0, ensuring proper fitment and connection to brake lines. This part does not include a reservoir or mounting hardware, so those components must be sourced separately. The absence of a sensor means it is compatible with vehicles that do not require integrated brake fluid level monitoring.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake hydraulic pressure for improved pedal feel\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 issues\u003c\/li\u003e\n\u003cli\u003eAddresses brake system failures related to internal cylinder wear\u003c\/li\u003e\n\u003cli\u003eEnsures proper brake fluid distribution to front and rear brakes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVerify compatibility with Lexus RX300 model year 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\u003eInspect brake lines and fittings for damage during replacement\u003c\/li\u003e\n\u003cli\u003eMounting hardware and reservoir must be reused or purchased separately\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M630139 brake master cylinder to meet or exceed OEM standards for fit and function. The aluminum construction provides corrosion resistance and durability under normal operating conditions. While mounting hardware and reservoir are not included, the master cylinder itself is backed by Dorman's quality control processes. Please consult Dorman's warranty policy for specific coverage details.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792226975925,"sku":"BKKX-M630139","price":133.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M630139_Fro.jpg?v=1774997622","url":"https:\/\/www.partcatalog.com\/products\/dorman-m630139-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}