At DMG Motorsports, we present the All Balls Racing Master Cylinder Rebuild Kit (21-81008) — a precision-engineered service kit designed to bring a tired, leaking rear master cylinder back to like-new performance. Built to OEM specifications, this kit takes the guesswork out of brake maintenance by supplying every internal component needed to stop fluid seepage and restore firm, reliable brake feel. Whether you're maintaining a weekend trail bike or prepping a race machine, this kit is the trusted, budget-friendly way to keep your braking system in top condition.

Features:

• Contains all components needed to re-seal a leaking rear master cylinder and restore consistent brake performance
• Includes cup seals, copper washers, o-rings, and replacement screws where applicable, built to meet OEM specifications
• Kit contents include two washers, one spring, one snap ring, two cup seals, and one boot for a complete rebuild
• Fits a wide range of Honda models including CR125R and CR250R (2002-2007), CRF250R (2004-2019), CRF250X, CRF450R, CRF450X, CRF450RX, CRF450L, and more
• Constructed from durable brass, rubber, and steel components for long-lasting, dependable sealing
• Backed by All Balls Racing's reputation for OEM-level engineering and quality aftermarket hard parts
• Easy bolt-in rebuild solution that avoids the cost of a full master cylinder replacement

Fitment