At DMG Motorsports, we present the All Balls Racing Rear Master Cylinder Rebuild Kit — the complete solution for restoring a leaking or spongy rear brake master cylinder on your Harley-Davidson Sportster. Built to replace OEM part number 42810-04B, this kit is engineered as a direct fit for all 2004-2006 XL Sportster models, including the 883, 883C, 883R, 883L, 1200C, 1200L, and 1200R Roadster. A weeping rear master cylinder isn't just an inconvenience — it's a safety issue, since brake fluid is corrosive and a compromised brake system can quickly become dangerous. This All Balls kit gives you everything needed to properly re-seal the unit and get your rear brake performing like new, without the expense of buying an entirely new master cylinder assembly.

Features:

• Complete rebuild kit contains all parts needed to re-seal a leaking rear master cylinder
• Includes cup seals, copper sealing washers, o-rings, and replacement screws where applicable
• Manufactured to meet OEM specifications for a proper, reliable fit and function
• Direct replacement for Harley-Davidson OEM part number 42810-04B
• Fits all 2004-2006 Harley-Davidson XL Sportster models
• Restores braking performance and helps stop fluid leaks caused by worn seals
• Trusted All Balls Racing quality for a durable, long-lasting repair