{"product_id":"dorman-m390279-brake-master-cylinder","title":"Dorman M390279 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Chevrolet and GMC Trucks\u003c\/h2\u003e\u003cp\u003eThe Dorman M390279 brake master cylinder is designed to restore proper brake function in Chevrolet and GMC heavy-duty trucks. Engineered with a 1.25-inch bore diameter and constructed from durable aluminum, this master cylinder includes a reservoir to ensure consistent brake fluid supply.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 1.25 inches for precise hydraulic pressure\u003c\/li\u003e\n\u003cli\u003eDurable aluminum construction for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid storage\u003c\/li\u003e\n\u003cli\u003eTwo outlet ports with rearward outlet size 1\/2-20 and secondary outlet thread diameter 9\/16-18\u003c\/li\u003e\n\u003cli\u003eCompatible with Chevrolet C3500, K3500, P30, and P3500 models\u003c\/li\u003e\n\u003cli\u003eMounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M390279 brake master cylinder is built to meet the hydraulic braking needs of heavy-duty Chevrolet and GMC trucks such as the C3500, K3500, P30, and P3500. Its aluminum body offers strength and resistance to corrosion, which is critical for long-term brake system reliability. The 1.25-inch bore diameter ensures proper hydraulic pressure is maintained for effective braking performance. This master cylinder features two outlets: a rearward outlet sized at 1\/2-20 and a secondary outlet with a 9\/16-18 thread diameter, allowing for secure brake line connections. The included reservoir provides a reliable source of brake fluid, though mounting hardware is not part of the package.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake pressure in Chevrolet C3500 and GMC K3500 trucks\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders in P30 and P3500 models\u003c\/li\u003e\n\u003cli\u003eAddresses brake fluid reservoir leaks or damage\u003c\/li\u003e\n\u003cli\u003eSolves inconsistent brake pedal feel or sponginess\u003c\/li\u003e\n\u003cli\u003eFixes brake system hydraulic failures due to master cylinder wear\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the Dorman M390279 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Since mounting hardware is not included, reuse existing hardware or acquire compatible fasteners. Verify outlet thread sizes (1\/2-20 rearward and 9\/16-18 secondary) to ensure proper brake line fitting. Inspect brake lines and connections for leaks after installation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M390279 brake master cylinder to meet or exceed OEM specifications for Chevrolet and GMC heavy-duty trucks. The aluminum construction and included reservoir contribute to long-lasting performance. While mounting hardware is not included, the part is backed by Dorman's quality standards. Please refer to Dorman's warranty policy for specific coverage details.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792143745205,"sku":"BKKX-M390279","price":90.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390279_Fro.jpg?v=1774997565","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390279-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}