{"product_id":"centric-131-66012-brake-master-cylinder","title":"Centric 131.66012 Brake Master Cylinder","description":"\u003ch2\u003eReliable Brake Master Cylinder for Chevrolet and GMC Trucks\u003c\/h2\u003e\u003cp\u003eThe Centric C-TEK Standard Brake Master Cylinder 131.66012 is engineered to restore precise brake control for heavy-duty Chevrolet and GMC trucks. Designed specifically for models like the C30, K3500, and P3500, this master cylinder ensures consistent hydraulic pressure for safe braking performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCast iron reservoir and master cylinder for durability\u003c\/li\u003e\n\u003cli\u003eSingle integral reservoir style included\u003c\/li\u003e\n\u003cli\u003eTwo mounting holes for secure installation\u003c\/li\u003e\n\u003cli\u003eMaster cylinder bore diameter of 1.313 inches (33.338 mm)\u003c\/li\u003e\n\u003cli\u003eIncludes master cylinder cap; push rod and brake booster not included\u003c\/li\u003e\n\u003cli\u003eTwo ports with inverted flare types: primary 1\/2\"-20 and secondary 9\/16\"-18 thread sizes\u003c\/li\u003e\n\u003cli\u003eCompatible with Chevrolet and GMC heavy-duty truck models C30, C3500, K30, K3500, P30, P3500, R30, R3500, V30, and V3500\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAbout the C-TEK Standard Brake Master Cylinder Line\u003c\/h2\u003e\u003cp\u003eThe C-TEK Standard Brake Master Cylinder line by Centric focuses on providing reliable, OEM-quality replacement parts for brake hydraulics. This product line emphasizes durable materials such as cast iron and precise bore sizing to maintain factory specifications. The 131.66012 part number is a direct replacement designed to meet the exact fit and function requirements for select Chevrolet and GMC heavy-duty trucks.\u003c\/p\u003e\u003ch2\u003eProduct Details and Specifications\u003c\/h2\u003e\u003cp\u003eThis brake master cylinder features a cast iron construction for both the reservoir and the cylinder body, ensuring long-lasting strength under demanding conditions. The single integral reservoir design simplifies installation and maintenance. With a bore diameter of 1.313 inches (33.338 mm), it provides consistent hydraulic pressure for effective braking. The unit includes a master cylinder cap but does not come with mounting hardware, push rod, brake booster, or bleeder hoses. It has two mounting holes and two outlet ports with inverted flare threads—primary outlet at 1\/2\"-20 and secondary outlet at 9\/16\"-18—compatible with standard brake line fittings.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Problem Resolution\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores brake pressure loss in Chevrolet and GMC heavy-duty trucks\u003c\/li\u003e\n\u003cli\u003eReplaces worn or leaking master cylinders causing brake fluid leaks\u003c\/li\u003e\n\u003cli\u003eSolves spongy or unresponsive brake pedal issues\u003c\/li\u003e\n\u003cli\u003eAddresses internal seal failures within the master cylinder bore\u003c\/li\u003e\n\u003cli\u003eEnsures proper brake fluid reservoir containment with integral design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eVerify compatibility with your specific Chevrolet or GMC truck model before installation\u003c\/li\u003e\n\u003cli\u003eUse proper brake fluid and bleed the brake system thoroughly after installation\u003c\/li\u003e\n\u003cli\u003eMounting hardware is not included; retain original hardware or source separately\u003c\/li\u003e\n\u003cli\u003eInspect brake booster and push rod components as they are not included with this part\u003c\/li\u003e\n\u003cli\u003eEnsure all connections use inverted flare fittings matching the specified thread sizes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eCentric's C-TEK Standard Brake Master Cylinder 131.66012 is manufactured to meet or exceed OEM standards for fit, form, and function. The cast iron construction and precise bore sizing contribute to reliable brake system performance. Warranty details are provided by Centric and typically cover defects in materials and workmanship under normal use conditions.\u003c\/p\u003e","brand":"Centric","offers":[{"title":"Default Title","offer_id":43635071549621,"sku":"BKNJ-131.66012","price":64.93,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/CE_13166012_Fro_185dc9ce-e2b1-4fa0-8165-35a49497d6f7.jpg?v=1774987559","url":"https:\/\/www.partcatalog.com\/products\/centric-131-66012-brake-master-cylinder","provider":"PartCatalog","version":"1.0","type":"link"}