{"product_id":"dorman-m390321-brake-master-cylinder","title":"Dorman M390321 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Chevrolet Astro and GMC Safari\u003c\/h2\u003e\u003cp\u003eThe Dorman M390321 brake master cylinder is designed specifically for Chevrolet Astro and GMC Safari models, providing dependable brake hydraulics performance. This aluminum master cylinder includes a reservoir and features a 1.25-inch bore diameter to ensure consistent braking pressure.\u003c\/p\u003e\u003ch2\u003eKey Features of the Dorman M390321 Brake Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Chevrolet Astro and GMC Safari vehicles\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\u003e1.25-inch master cylinder bore diameter for precise hydraulic control\u003c\/li\u003e\n\u003cli\u003eTwo outlets with rearward outlet size of 1\/2-20 and secondary outlet thread diameter of 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\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman M390321 brake master cylinder is engineered to meet the specific hydraulic requirements of Chevrolet Astro and GMC Safari models. Its aluminum construction offers corrosion resistance and long-lasting durability. The included reservoir simplifies installation and maintenance by providing an integrated brake fluid container. With a 1.25-inch bore diameter, this master cylinder delivers consistent hydraulic pressure to the braking system, ensuring reliable stopping power. The two outlet ports, sized at 1\/2-20 for the rearward outlet and 9\/16-18 for the secondary outlet, accommodate standard brake line fittings for straightforward connection.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by This Brake Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal sinking or sponginess due to internal leaks\u003c\/li\u003e\n\u003cli\u003eLoss of hydraulic pressure affecting braking performance\u003c\/li\u003e\n\u003cli\u003eBrake fluid reservoir leaks or damage\u003c\/li\u003e\n\u003cli\u003eCorrosion or wear in the master cylinder bore\u003c\/li\u003e\n\u003cli\u003eIncompatible or damaged master cylinder causing brake failure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure compatibility with Chevrolet Astro and GMC Safari before installation\u003c\/li\u003e\n\u003cli\u003eBleed the brake system thoroughly after installation to remove air\u003c\/li\u003e\n\u003cli\u003eUse appropriate brake fluid as specified by the vehicle manufacturer\u003c\/li\u003e\n\u003cli\u003eMounting hardware is not included; retain original hardware or source separately\u003c\/li\u003e\n\u003cli\u003eInspect brake lines and fittings for wear or damage during installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty Information\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M390321 brake master cylinder to meet or exceed OEM specifications for Chevrolet Astro and GMC Safari vehicles. The aluminum construction and integrated reservoir contribute to long service life. While mounting hardware is not included, the product undergoes quality checks to ensure proper fit and function. Warranty details should be confirmed through the original product documentation or Dorman's official resources.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792152887477,"sku":"BKKX-M390321","price":94.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390321_Fro.jpg?v=1774997571","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390321-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}