At DMG Motorsports, we present the All Balls Front Master Cylinder Rebuild Kit 21-81147 (cross-referenced to Harley-Davidson OEM 42803-07A) — a precision-engineered solution for restoring the front brake master cylinder on your Sportster. When a master cylinder starts weeping fluid or feels spongy at the lever, this kit gives you everything needed to reseal and rebuild it, saving you the cost of a full replacement unit. All Balls Racing builds these kits to meet OEM specifications, so you can count on a proper fit and reliable, leak-free performance once the job is done.

Features:

• Contains all of the components needed to re-seal a leaking master cylinder, including cup seals, copper washers, o-rings, and replacement screws where applicable
• Includes everything needed for the rebuild — copper washers, replacement screws, and where applicable, cup seals and O-rings
• Designed as a direct cross-reference for Harley-Davidson front master cylinder P/N 42803-07A
• Fits 2007-2013 Harley Sportster XL single-disc models with a 7/16" bore front master cylinder
• Restores like-new sealing performance without the expense of a complete master cylinder replacement
• Backed by All Balls Racing's reputation for durable, precision-fit aftermarket powersports components

Fitment