{"product_id":"aa-ignition-brake-master-cylinder-for-cadillac-chevrolet-gmc-1999-2002-direct-fit-precision-bored-replacement","title":"AA Ignition Brake Master Cylinder for Cadillac\/Chevrolet\/GMC 1999–2002 – Direct-Fit, Precision-Bored Replacement","description":"\u003cp\u003e\u003cstrong\u003eAA Ignition Brake Master Cylinder: a direct-fit replacement that restores hydraulic brake pressure for compatible Cadillac, Chevrolet and GMC models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your brake pedal feels low, sinks, or your vehicle is showing signs of a master cylinder leak, this AA Ignition brake master cylinder is engineered to be a straightforward swap for many GM trucks and SUVs from the 1999–2002 era. It cross-references common OEM and aftermarket part numbers such as M630031, 18040252 and 18060789 so you can match your original part number and confirm fitment before purchase. Built with a precision-bored cylinder and improved sealing, the unit is designed to meet or exceed factory specifications without requiring modifications.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this master cylinder affect pedal feel and braking response?\u003c\/h3\u003e\n\u003cp\u003eReplacing a worn master cylinder typically returns a firmer pedal and more consistent brake pressure. This unit restores the hydraulic pressure that actuates the brake system, addressing symptoms like a spongy or sinking pedal caused by internal seal wear or fluid leakage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecision-bored cylinder for uniform bore surface and predictable pressure.\u003c\/li\u003e\n  \u003cli\u003eNew internal seals to eliminate internal bypass and loss of pressure.\u003c\/li\u003e\n  \u003cli\u003eDirect-fit ports and mounting for a plug-and-play installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and part numbers does this cylinder fit?\u003c\/h3\u003e\n\u003cp\u003eThis master cylinder is compatible with a range of Cadillac, Chevrolet and GMC models from the early 2000s; always verify with your vehicle’s VIN or existing part number. It replaces several common numbers used by OEMs and aftermarket suppliers to simplify identification.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits Cadillac Escalade and Escalade EXT (2002) and multiple Chevrolet models including Avalanche 1500, Blazer, Silverado 1500\/1500 HD, Suburban and Tahoe (1999–2002 ranges).\u003c\/li\u003e\n  \u003cli\u003eCross-references: M630031, M630031AA, 18040252, 18060789, 19209249.\u003c\/li\u003e\n  \u003cli\u003eCheck the compatibility chart and match the part number on your old master cylinder before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know about installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eThe part is designed for a straightforward swap with factory-style mounting and port locations, but safe, proper installation requires attention to bleeding and fluid cleanliness. For best results, bench-bleed the master cylinder before connecting brake lines and flush the brake fluid in the system per manufacturer guidelines.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit design means no modification of mounting points or lines is typically required.\u003c\/li\u003e\n  \u003cli\u003eBench-bleeding removes trapped air inside the cylinder prior to vehicle installation.\u003c\/li\u003e\n  \u003cli\u003eReplace brake fluid and bleed the entire system after installation for consistent performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat warranty and quality assurances are included?\u003c\/h3\u003e\n\u003cp\u003eWhile this is not an OEM-branded component, AA Ignition manufactures the unit to meet or surpass factory tolerances and backs it with a lifetime warranty. If the master cylinder fails due to manufacturing defects, AA Ignition will replace it, helping avoid dealer-level repair costs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngineered to factory-style specifications with improved sealing components.\u003c\/li\u003e\n  \u003cli\u003eLifetime warranty from AA Ignition for replacement on qualified failures.\u003c\/li\u003e\n  \u003cli\u003eRecommended to verify part number compatibility before purchase to ensure warranty coverage applies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This master cylinder is intended for owners and mechanics working on late-1990s to early-2000s Cadillac, Chevrolet or GMC trucks and SUVs who need a reliable, direct-fit replacement for worn or leaking master cylinders. If you value a plug-and-play swap that restores braking pressure and want a part backed by a lifetime warranty, this unit offers a cost-effective alternative to dealer-sourced assemblies. Always verify vehicle fitment and follow safe installation and bleeding procedures.\u003c\/p\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: Will this master cylinder fit my Silverado 1500?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It fits many 1999–2002 Silverado 1500 models; confirm by matching your existing part number to the listed cross-references.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need to bench-bleed this master cylinder?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—bench-bleeding before installation reduces trapped air and helps ensure proper braking performance after installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AA Ignition","offers":[{"title":"Default Title","offer_id":55169285554519,"sku":"B08LQQP8YD","price":84.46,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/aa-ignition-master-cylinder-front-view.jpg?v=1790421705","url":"https:\/\/britishgarage.co.uk\/products\/aa-ignition-brake-master-cylinder-for-cadillac-chevrolet-gmc-1999-2002-direct-fit-precision-bored-replacement","provider":"British Garage","version":"1.0","type":"link"}