{"product_id":"dorman-brake-master-cylinder-m630031-for-gm-trucks-suvs-1999-2002-direct-fit-100-new-with-epdm-seals","title":"Dorman Brake Master Cylinder M630031 for GM Trucks\/SUVs (1999–2002) — Direct-Fit, 100% New with EPDM Seals","description":"\u003cp\u003e\u003cstrong\u003eThe Dorman M630031 Brake Master Cylinder is a 100% new, direct-fit replacement engineered to restore original braking function on select Chevrolet, GMC and Cadillac trucks and SUVs from 1999–2002.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis master cylinder is built to match the casting, fit and function of the factory part while using new materials throughout for reliable, long-lasting performance. Manufactured to meet SAE standards, the unit includes high-quality EPDM rubber components formulated for resistance to glycol-based brake fluids. Before purchase, verify your exact trim and year using the vehicle garage tool to confirm fitment.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles does this Dorman master cylinder fit?\u003c\/h3\u003e\n\u003cp\u003eThe M630031 is designed for specific GM full-size trucks and SUVs across model years primarily between 1999 and 2002. Compatibility covers multiple Chevrolet and GMC models plus Cadillac Escalade variants—always check the Confirmed Fit bar and any fitment notes in the garage tool for precise match details.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eChevrolet: Avalanche 1500 (2002), Blazer (2000–2002), Silverado 1500\/1500 HD (1999–2002), Suburban 1500 (2000–2002), Tahoe (2000–2002)\u003c\/li\u003e\n  \u003cli\u003eGMC: Sierra 1500\/1500 HD (1999–2002), Yukon\/Yukon XL 1500 \u0026amp; 2500 (2000–2002)\u003c\/li\u003e\n  \u003cli\u003eCadillac: Escalade and Escalade EXT (2002)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this master cylinder match the original equipment?\u003c\/h3\u003e\n\u003cp\u003eDorman engineered this unit to replicate the original casting material and dimensions so it integrates with existing brake lines, booster and mounting points. The mechanical design aims to mirror OE performance characteristics for pedal feel and hydraulic operation under typical driving conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHousing cast to mimic original material and shape for proper fit\u003c\/li\u003e\n  \u003cli\u003eMounting bosses and ports located to match factory connections\u003c\/li\u003e\n  \u003cli\u003eNew internal components for predictable hydraulic response\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and standards are used in the M630031?\u003c\/h3\u003e\n\u003cp\u003eThe unit is built entirely from new materials rather than being remanufactured, with rubber seals made from EPDM to resist breakdown from glycol-based brake fluids. Production follows strict SAE specifications to ensure durability and compatibility with typical braking systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e100% new construction—no remanufactured parts\u003c\/li\u003e\n  \u003cli\u003eEPDM rubber components for fluid resistance and longevity\u003c\/li\u003e\n  \u003cli\u003eManufactured to meet SAE International standards for quality\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before installing this master cylinder?\u003c\/h3\u003e\n\u003cp\u003eConfirm fitment by entering your vehicle trim in the garage tool and reviewing any fitment notes. Inspect the brake booster, lines and fittings for wear or leaks; replacing these related items as needed ensures the new master cylinder operates without issues after installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUse the garage tool and Confirmed Fit bar to verify compatibility\u003c\/li\u003e\n  \u003cli\u003eCheck brake booster, lines, hose ends and fittings for damage\u003c\/li\u003e\n  \u003cli\u003eBleed the brake system completely after installation to remove air\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Dorman M630031 is intended for owners and independent technicians working on late‑1990s to early‑2000s Chevrolet, GMC and Cadillac full‑size trucks and SUVs who need a dependable, brand-new master cylinder that duplicates original fit and function. It’s well suited for restorations, routine brake system repairs, or when an aging or leaking master cylinder is causing reduced pedal feel or fluid loss. Remember to verify fitment for your exact model and year before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecise replacement - cylinder housing is constructed to match the casting material of the original part and ensure similar performance\u003c\/li\u003e\n  \u003cli\u003eDurable design - all rubber components are made of quality EPDM compound for resistance to glycol-based brake fluid\u003c\/li\u003e\n  \u003cli\u003e100% new - made entirely of new materials, not remanufactured, to ensure highest quality and safety\u003c\/li\u003e\n  \u003cli\u003eStrict specifications - made to meet rigorous SAE International standards\u003c\/li\u003e\n  \u003cli\u003eEnsure fit - Input your vehicle into the garage tool and check Confirmed Fit bar at the top of the page. If there is an “i” in a blue circle, additional verification is needed. Please hover over the \"i\" to verify fitment notes match your vehicle.\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 M630031 a new or remanufactured part?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The M630031 is 100% new—none of its components are remanufactured.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need to bleed the brakes after installing this master cylinder?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Fully bleeding the brake system after installation removes air and restores proper pedal feel.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":48080144564382,"sku":"B001PYTM7C","price":114.17,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/dorman-m630031-front-view.jpg?v=1785779279","url":"https:\/\/northtrailauto.ca\/products\/dorman-brake-master-cylinder-m630031-for-gm-trucks-suvs-1999-2002-direct-fit-100-new-with-epdm-seals","provider":"North Trail Auto","version":"1.0","type":"link"}