At DMG Motorsports, we present the All Balls Racing Rear Master Cylinder Rebuild Kit (SKU 21-81149, Kit No. 42738-08) — a precision-engineered seal kit designed to bring a leaking or spongy rear brake master cylinder back to like-new performance. Rather than paying for a full replacement cylinder, this kit lets you restore the internal sealing components at a fraction of the cost, using parts built to meet OEM specifications. This kit is the correct fitment for all 2008 and later Harley-Davidson XR1200 models, matching the factory kit number 42738-08 exactly.

Features:

• Complete rebuild kit contains all parts needed to re-seal a leaking rear master cylinder
• Includes cup seals, copper washers, o-rings, and replacement screws where applicable
• Engineered to meet OEM specifications for a proper, reliable fit and function
• Fits all 2008 and later Harley-Davidson XR1200 models
• Direct replacement parts install using standard service manual procedures
• An affordable way to restore braking performance instead of replacing the entire master cylinder assembly
• Pair with fresh DOT 4 brake fluid and new brake line gaskets for a complete, safe rear brake service