At DMG Motorsports, we present the All Balls Racing Front Master Cylinder Rebuild Kit (part no. 21-81150), engineered to restore a leaking or spongy front brake master cylinder back to like-new operation. This kit is a direct cross-reference for the Harley-Davidson OEM front master cylinder repair kit 42803-04B, making it an ideal, affordable alternative for riders looking to service their factory master cylinder without paying dealership prices. Instead of replacing an entire master cylinder assembly, this kit gives you every internal wear component needed to properly reseal the unit and get your front brake feeling firm and responsive again. All Balls Racing is a trusted name in powersports hydraulic components, and DMG Motorsports is proud to stock this kit for riders who want a reliable, budget-friendly repair solution.

Features:

• Complete rebuild kit contains all the parts needed to re-seal a leaking front master cylinder
• Includes cup seals, copper washers, o-rings, and replacement screws where applicable
• Direct cross-reference to Harley-Davidson OEM front master cylinder repair kit part number 42803-04B
• Restores factory sealing performance without the cost of a full master cylinder replacement
• Sold as a complete, position-specific (front) kit for straightforward installation
• A cost-effective solution for eliminating brake fluid leaks and restoring proper lever feel

Fitment