{"product_id":"dorman-m390178-brake-master-cylinder","title":"Dorman M390178 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Chevrolet, Oldsmobile, and Pontiac\u003c\/h2\u003e\u003cp\u003eThe Dorman M390178 brake master cylinder is engineered to restore proper brake hydraulics in select GM minivans. Designed specifically for Chevrolet Lumina APV, Oldsmobile Silhouette, and Pontiac Trans Sport models, this master cylinder ensures consistent brake fluid pressure and reliable stopping power.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eMaster cylinder bore diameter: 24 mm for precise hydraulic control\u003c\/li\u003e\n\u003cli\u003eConstructed from durable aluminum material for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid storage and monitoring\u003c\/li\u003e\n\u003cli\u003eEquipped with a sensor to support brake system diagnostics\u003c\/li\u003e\n\u003cli\u003eTwo outlets with secondary outlet thread diameter of 10 mm (M10 x 1.0 thread pitch)\u003c\/li\u003e\n\u003cli\u003eRearward outlet size: M10 x 1.0 for secure brake line connections\u003c\/li\u003e\n\u003cli\u003ePackage contains the master cylinder unit only; mounting hardware not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dorman M390178 brake master cylinder is a direct replacement part designed to meet the specifications of original equipment for Chevrolet Lumina APV, Oldsmobile Silhouette, and Pontiac Trans Sport vehicles. Its 24 mm bore diameter allows for accurate brake fluid displacement, ensuring consistent pedal feel and braking performance. The aluminum construction offers enhanced durability and resistance to corrosion, extending the service life of the component. This master cylinder comes with an integrated reservoir and sensor, facilitating fluid level monitoring and brake system diagnostics. The two outlet ports, including a rearward outlet sized M10 x 1.0, provide secure connections to the brake lines, maintaining system integrity.\u003c\/p\u003e\u003ch2\u003eCommon Brake Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal sinking or sponginess due to master cylinder wear\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from the master cylinder reservoir or outlets\u003c\/li\u003e\n\u003cli\u003eInconsistent brake pressure affecting stopping performance\u003c\/li\u003e\n\u003cli\u003eFaulty brake fluid level sensor triggering warning lights\u003c\/li\u003e\n\u003cli\u003eCorrosion-related master cylinder failure in older vehicles\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure compatibility with Chevrolet Lumina APV, Oldsmobile Silhouette, or Pontiac Trans Sport 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 replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures the M390178 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable operation within the brake hydraulic system. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to the product documentation for exact warranty terms.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43792116187317,"sku":"BKKX-M390178","price":142.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M390178_Fro.jpg?v=1774997554","url":"https:\/\/www.partcatalog.com\/products\/dorman-m390178-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}