{"product_id":"dorman-brake-master-cylinder-m40000-for-1962-1966-gm-vehicles-100-new-oe-style-fit","title":"Dorman Brake Master Cylinder M40000 for 1962–1966 GM Vehicles — 100% New OE-Style Fit","description":"\u003cp\u003e\u003cstrong\u003eThe Dorman M40000 Brake Master Cylinder is a 100% new, precision-engineered replacement designed to match the original master cylinder fit and function for select 1962–1966 GM and related vehicles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you own a vintage Buick, Chevrolet, GMC, Oldsmobile, Pontiac or Jeep from the early-to-mid 1960s and need a reliable brake master cylinder replacement, the Dorman M40000 restores proper hydraulic control using new materials and OE-style dimensions. Built to SAE standards and assembled with high-quality EPDM rubber components, this master cylinder is made to duplicate the original casting, ports, and mounting, helping maintain braking performance and vehicle safety when repairing classic braking systems.\u003c\/p\u003e\n\n\u003ch3\u003eWill this master cylinder fit my classic car?\u003c\/h3\u003e\n\u003cp\u003eCompatibility depends on year, make, and trim. The M40000 is listed for many GM and related models from 1962 through 1966—ranging from Chevy Impala and C10 trucks to Pontiac Bonneville and Oldsmobile Cutlass. Use the vehicle garage tool on the product page to confirm exact fitment for your specific trim and brake configuration before purchasing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits numerous models: Chevrolet, Buick, Pontiac, Oldsmobile, GMC, Jeep (1962–1966)\u003c\/li\u003e\n  \u003cli\u003eCheck the garage tool: verify trim, brake type, and year\u003c\/li\u003e\n  \u003cli\u003eDesigned to match original casting, ports, and mounting locations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this replacement compare to the original part?\u003c\/h3\u003e\n\u003cp\u003eDorman engineered the M40000 to reproduce the original master cylinder's housing shape and port layout so it installs and functions like the factory unit. Unlike remanufactured cores, this part is entirely new, minimizing wear-related failures and offering consistent bore dimensions for proper hydraulic pressure and pedal feel.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e100% new construction—no remanufactured components\u003c\/li\u003e\n  \u003cli\u003eHousing cast to match original material and dimensions\u003c\/li\u003e\n  \u003cli\u003eEPDM rubber parts resist degradation from glycol-based brake fluid\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and standards are used in the M40000?\u003c\/h3\u003e\n\u003cp\u003eThe master cylinder uses modern materials selected for longevity and compatibility with standard brake fluids. Rubber seals and boots are made from EPDM compounds resistant to glycol-based fluids, while the assembly meets SAE International specifications for durability and performance under normal operating conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEPDM rubber components for fluid resistance and durability\u003c\/li\u003e\n  \u003cli\u003eManufactured to meet SAE standards for automotive hydraulic parts\u003c\/li\u003e\n  \u003cli\u003eQuality control ensures consistent bore and port tolerances\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know before installation?\u003c\/h3\u003e\n\u003cp\u003ePrepare to bench-bleed and properly torque mounting hardware during installation to ensure a firm pedal and leak-free operation. Inspect related components—lines, hoses, fittings, and the proportioning valve—and replace any worn items to prevent contamination and ensure system integrity after fitting the new master cylinder.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAlways bench-bleed the master cylinder before final installation\u003c\/li\u003e\n  \u003cli\u003eInspect and, if needed, replace brake lines, hoses, and fittings\u003c\/li\u003e\n  \u003cli\u003eFollow torque specs and bleed the entire braking system after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Dorman M40000 is aimed at classic car owners, restorers, and mechanics working on 1962–1966 GM-family vehicles and related models who need a reliable, new master cylinder that duplicates original fit and function. If you want a direct-fit replacement built to modern material standards—without using rebuilt cores—this part provides a practical solution to restore braking function while preserving the vehicle’s original mounting and plumbing layout.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFeatures:\n    \u003cul\u003e\n      \u003cli\u003ePrecise replacement matching original casting material and performance\u003c\/li\u003e\n      \u003cli\u003eDurable EPDM rubber components for resistance to glycol-based fluids\u003c\/li\u003e\n      \u003cli\u003e100% new construction—no remanufactured parts\u003c\/li\u003e\n      \u003cli\u003eManufactured to SAE International specifications\u003c\/li\u003e\n      \u003cli\u003eVerify fitment with the garage tool before buying\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the Dorman M40000 new or remanufactured?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The Dorman M40000 is 100% new—no remanufactured components are used.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use modern brake fluid with this master cylinder?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. EPDM rubber components are compatible with glycol-based brake fluids used in classic cars.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":48082894389406,"sku":"B001PYNZYS","price":61.79,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/dorman-m40000-front-view.jpg?v=1785818599","url":"https:\/\/northtrailauto.ca\/products\/dorman-brake-master-cylinder-m40000-for-1962-1966-gm-vehicles-100-new-oe-style-fit","provider":"North Trail Auto","version":"1.0","type":"link"}