{"product_id":"dorman-m630021-brake-master-cylinder","title":"Dorman M630021 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Chevrolet, GMC, Isuzu, and Oldsmobile\u003c\/h2\u003e\u003cp\u003eThe Dorman M630021 brake master cylinder is engineered to restore proper brake hydraulics in select Chevrolet, GMC, Isuzu, and Oldsmobile vehicles. Designed with an aluminum body and a built-in reservoir, this master cylinder supports consistent brake fluid delivery for improved stopping performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 1 inch\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum material\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid\u003c\/li\u003e\n\u003cli\u003eTwo outlet ports for brake line connections\u003c\/li\u003e\n\u003cli\u003eRearward outlet size: 1\/2-20 thread\u003c\/li\u003e\n\u003cli\u003eSecondary outlet thread diameter: 9\/16-18\u003c\/li\u003e\n\u003cli\u003ePackage contains the master cylinder only; mounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Details and Compatibility\u003c\/h2\u003e\u003cp\u003eThe Dorman M630021 brake master cylinder is specifically designed for compatibility with Chevrolet Blazer, GMC Jimmy, Isuzu Hombre, Oldsmobile Bravada, Chevrolet S10, and GMC Sonoma models. Its 1-inch bore diameter and aluminum construction provide reliable hydraulic pressure and corrosion resistance. The integrated reservoir simplifies installation and maintenance by ensuring proper brake fluid containment. Featuring two outlets with precise thread sizes (1\/2-20 rearward and 9\/16-18 secondary), this master cylinder supports secure brake line connections for effective brake system operation.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake pressure in vehicles experiencing soft or spongy brake pedal feel\u003c\/li\u003e\n\u003cli\u003eReplaces leaking or damaged master cylinders causing brake fluid loss\u003c\/li\u003e\n\u003cli\u003eAddresses brake system failure due to internal seal wear or corrosion\u003c\/li\u003e\n\u003cli\u003eImproves brake response in Chevrolet Blazer, GMC Jimmy, and related models\u003c\/li\u003e\n\u003cli\u003eEnsures proper brake fluid flow in Isuzu Hombre and Oldsmobile Bravada vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M630021 master cylinder requires removal of the old unit and proper connection of brake lines to the two outlet ports. Since mounting hardware is not included, retain or source compatible fasteners for secure mounting. Bleed the brake system thoroughly after installation to remove air and ensure optimal brake performance. Verify thread sizes (1\/2-20 rearward and 9\/16-18 secondary) match brake line fittings before assembly.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M630021 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction offers corrosion resistance and durability under normal operating conditions. While mounting hardware is not included, the product is backed by Dorman's quality standards. Please consult Dorman's warranty policy for specific coverage details.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792210231477,"sku":"BKKX-M630021","price":104.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M630021_Fro.jpg?v=1774997600","url":"https:\/\/www.partcatalog.com\/products\/dorman-m630021-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}