{"product_id":"dorman-m39434-brake-master-cylinder","title":"Dorman M39434 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Chevrolet and GMC Trucks\u003c\/h2\u003e\u003cp\u003eThe Dorman M39434 brake master cylinder is engineered to restore proper brake hydraulics in select Chevrolet and GMC truck models. Designed with a durable cast iron construction and a 1.25-inch bore diameter, this master cylinder ensures consistent brake fluid pressure for safe stopping performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 1.25 inches for precise hydraulic control\u003c\/li\u003e\n\u003cli\u003eConstructed from cast iron for long-lasting durability\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 multiple Chevrolet and GMC truck models including C10 Suburban, C20, K20, and P30\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M39434 brake master cylinder is designed specifically for brake hydraulics systems requiring a 1.25-inch bore diameter. Its cast iron material provides strength and resistance to wear, making it suitable for heavy-duty applications. The included reservoir allows for proper brake fluid containment, while the two outlets facilitate connection to the brake lines. The rearward outlet size measures 1\/2-20, and the secondary outlet thread diameter is 9\/16-18, ensuring compatibility with factory brake line fittings.\u003c\/p\u003e\u003ch2\u003eCompatible Chevrolet and GMC Models\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is compatible with a range of Chevrolet and GMC trucks, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eChevrolet C10 Suburban, C20, C20 Suburban, C30\u003c\/li\u003e\n\u003cli\u003eChevrolet C1500 Suburban, C2500, C2500 Suburban\u003c\/li\u003e\n\u003cli\u003eGMC G30, K10 Suburban, K20, K20 Suburban\u003c\/li\u003e\n\u003cli\u003eGMC K1500 Suburban, K2500, K2500 Suburban\u003c\/li\u003e\n\u003cli\u003eChevrolet and GMC P20, P30, P2500, P3500\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCommon Brake System Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eLoss of brake fluid pressure causing spongy brake pedal feel\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from a worn or damaged master cylinder\u003c\/li\u003e\n\u003cli\u003eInconsistent braking performance or delayed brake response\u003c\/li\u003e\n\u003cli\u003eBrake warning light activation due to hydraulic failure\u003c\/li\u003e\n\u003cli\u003eBrake pedal sinking or failure to maintain pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eWhen installing the Dorman M39434 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify that the outlet thread sizes (1\/2-20 rearward and 9\/16-18 secondary) match your vehicle’s brake lines. Since mounting hardware is not included, retain original hardware or source compatible fasteners. Always follow manufacturer torque specifications and safety procedures during installation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman brake master cylinders are manufactured to meet or exceed OEM standards for fit, form, and function. The M39434 part number undergoes rigorous quality control to ensure reliable brake system performance. Please refer to Dorman’s warranty policy for coverage details on this brake master cylinder.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":52089071370421,"sku":"BKKX-M39434","price":74.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M39434_Fro.jpg?v=1775148225","url":"https:\/\/www.partcatalog.com\/products\/dorman-m39434-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}