{"product_id":"dorman-m99031-brake-master-cylinder","title":"Dorman M99031 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Buick, Chevrolet, Oldsmobile, and Pontiac\u003c\/h2\u003e\u003cp\u003eThe Dorman M99031 brake master cylinder is designed to restore proper brake hydraulics in select Buick, Chevrolet, Oldsmobile, and Pontiac vehicles. Engineered with a cast iron body and a 0.938-inch bore diameter, this master cylinder ensures consistent brake fluid pressure for safe and effective braking performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCast iron master cylinder material for durability\u003c\/li\u003e\n\u003cli\u003eIncludes reservoir for brake fluid containment\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 Buick, Chevrolet, Oldsmobile, and Pontiac 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 M99031 master cylinder features a 0.938-inch bore diameter, which is critical for maintaining proper hydraulic pressure in the brake system. Constructed from cast iron, this master cylinder offers strength and resistance to wear over time. It comes with an integrated reservoir to hold brake fluid, eliminating the need for a separate component. The unit has two outlets: a rearward outlet sized at 1\/2-20 and a secondary outlet with a 9\/16-18 thread diameter, designed to connect seamlessly with your vehicle's brake lines. Note that mounting hardware is not included and must be sourced separately.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder is compatible with a range of Buick, Chevrolet, Oldsmobile, and Pontiac models, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBuick Century, Regal\u003c\/li\u003e\n\u003cli\u003eChevrolet El Camino, Malibu, Monte Carlo\u003c\/li\u003e\n\u003cli\u003eOldsmobile Cutlass, Cutlass Calais, Cutlass Cruiser, Cutlass Supreme, Grand LeMans, LeMans\u003c\/li\u003e\n\u003cli\u003ePontiac Grand Am, Grand Prix\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUse the Dorman M99031 to replace a failing or leaking master cylinder in these vehicles to restore proper brake function.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by This Master Cylinder\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrake pedal sinking or sponginess due to internal leaks\u003c\/li\u003e\n\u003cli\u003eBrake fluid leaks from the master cylinder reservoir or outlets\u003c\/li\u003e\n\u003cli\u003eReduced braking efficiency or uneven brake pressure\u003c\/li\u003e\n\u003cli\u003eBrake warning light activation related to hydraulic failure\u003c\/li\u003e\n\u003cli\u003eContaminated or damaged master cylinder bore affecting brake performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the brake system is properly bled after installation to remove air\u003c\/li\u003e\n\u003cli\u003eVerify compatibility with your specific vehicle year and model before installation\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 purchase 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 M99031 master cylinder to meet or exceed OEM standards for fit and function. The cast iron construction provides durability and long service life. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Consult product documentation or Dorman directly for exact warranty terms.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43789380485301,"sku":"BKKX-M99031","price":53.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DB_M99031_Fro_96a6f3ca-edcb-4aca-8033-f2403f8082e3.jpg?v=1774997531","url":"https:\/\/www.partcatalog.com\/products\/dorman-m99031-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}