{"product_id":"dorman-m39578-brake-master-cylinder","title":"Dorman M39578 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Chevrolet and GMC Vehicles\u003c\/h2\u003e\u003cp\u003eThe Dorman M39578 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Chevrolet and GMC models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Chevrolet Astro, GMC G10, G20, P20, P2500, and Safari models\u003c\/li\u003e\n\u003cli\u003eDual bore diameters: 1.125 inch and 1.578 inch for balanced braking\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum for corrosion resistance and longevity\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid storage\u003c\/li\u003e\n\u003cli\u003eTwo outlets with rearward outlet size 1\/2-20 and secondary outlet thread diameter 9\/16-18\u003c\/li\u003e\n\u003cli\u003ePackage contains master cylinder only; mounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Features and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman M39578 master cylinder features dual bore diameters of 1.125 and 1.578 inches, designed to provide optimal hydraulic pressure distribution between front and rear brakes. Its aluminum construction offers enhanced durability and resistance to corrosion, which is critical for maintaining brake system integrity over time. The included reservoir simplifies installation by providing a ready-to-use brake fluid container. This master cylinder has two outlets, with a rearward outlet size of 1\/2-20 and a secondary outlet thread diameter of 9\/16-18, ensuring compatibility with the brake lines on Chevrolet Astro and GMC G-series vans and trucks.\u003c\/p\u003e\u003ch2\u003eApplications and Common Brake System Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake fluid pressure in vehicles experiencing spongy or unresponsive brakes\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders causing brake fluid loss\u003c\/li\u003e\n\u003cli\u003eSolves uneven braking due to faulty bore diameters or internal seals\u003c\/li\u003e\n\u003cli\u003eAddresses brake pedal sinking or failure to maintain pressure\u003c\/li\u003e\n\u003cli\u003eImproves overall brake system reliability in Chevrolet Astro and GMC G10, G20, P20, P2500, and Safari models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman M39578 master cylinder requires proper brake system bleeding to remove air and ensure optimal hydraulic function. Note that mounting hardware is not included, so existing hardware should be inspected and replaced if necessary. Verify compatibility with your specific vehicle model and year before installation. It is recommended to consult a professional mechanic if unfamiliar with brake hydraulic systems.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman manufactures this brake master cylinder to meet or exceed OEM specifications, using high-quality aluminum materials for durability. While mounting hardware is not included, the product is designed for direct replacement in compatible Chevrolet and GMC vehicles. Warranty coverage details should be confirmed at the point of purchase or through Dorman's official channels.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43789344833717,"sku":"BKKX-M39578","price":73.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M39578_Fro.jpg?v=1774997483","url":"https:\/\/www.partcatalog.com\/products\/dorman-m39578-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}