Dorman M630428 Brake Master Cylinder

Brake Master Cylinder for Mazda 3

This Dorman brake master cylinder is built for specific 2004-2008 Mazda 3 applications and is engineered to match the original unit’s design, function, and performance. Dorman M630428 uses new, high-quality materials for a durable brake hydraulic replacement with the correct 1-inch bore and integrated reservoir.

• Direct replacement brake master cylinder for select 2004-2008 Mazda 3 models
• 1-inch master cylinder bore diameter for OE-style brake pedal and hydraulic response
• Aluminum master cylinder construction for strength and corrosion resistance
• Reservoir included for a complete master cylinder assembly
• Sensor included for applications that require it
• Two outlets with M10 x 1.0 rearward outlet thread size
• Fits brake master cylinders with a 25 mm bore size

Detailed Product Overview

Dorman M630428 is a brake master cylinder designed for 2004, 2005, 2006, 2007, and 2008 Mazda 3 vehicles. It is built to match the original master cylinder’s fit and hydraulic function, making it a practical replacement when the factory unit shows wear or internal leakage. This part cross-references Cardone New 13-3109 and Cardone Reman 11-3109 for the same application.

With an aluminum body, two outlets, and an included reservoir, this Mazda 3 brake master cylinder supports proper brake system pressure transfer from the pedal to the hydraulic circuits. Dorman M630428 is also listed with interchange references including Centric Parts 130.45423 and Raybestos Brakes MC391048.

Common Brake System Issues It Can Address

• Low or sinking brake pedal caused by internal master cylinder bypass
• Brake fluid leakage at the master cylinder body or outlet ports
• Uneven hydraulic pressure affecting brake pedal feel
• Warning light concerns related to the master cylinder sensor circuit
• Restoration of braking performance after master cylinder wear

Installation Notes and Tips

Verify the bore size before ordering; this part is specified for 25 mm brake master cylinder applications. Confirm outlet thread sizes and sensor requirements against the original unit on the vehicle. After installation, bleed the brake system thoroughly to remove air from the hydraulic lines and restore a firm pedal.

Quality Assurance

Dorman designs this replacement master cylinder to match the original part’s design, function, and performance on the listed Mazda 3 applications. It is manufactured from new materials for a durable brake hydraulic repair.