Retainer Pushrod Rubber Ring .48x.25x .25 Lg

The Wilwood Retainer Pushrod Rubber Ring .48x.25x.25 Lg (SKU: WIL210-2504) is a critical sealing component designed for marine brake systems and hydraulic applications where pushrod retention and fluid integrity are essential. As anyone who has spent serious time on the water knows, brake performance under load—whether you're piloting a center console, trawler, or performance speedboat—depends on components that can withstand constant pressure cycles and corrosive saltwater environments. This elastomer O-ring serves as the primary seal between the master cylinder pushrod and its housing, preventing hydraulic fluid leakage while maintaining consistent brake response when you need it most.

Engineered from durable rubber compound, this retainer ring features precise dimensions (0.48 inch outer diameter, 0.25 inch inner diameter, and 0.25 inch thickness) that ensure a tight, reliable fit within Wilwood master cylinder assemblies commonly found in hydraulic brake systems aboard marine vessels. The .48x.25x.25 geometry is specifically matched to Wilwood's engineered tolerances, allowing the ring to expand and contract with thermal cycles while maintaining its sealing properties. The minimal weight (0.01 lbs) reflects its compact construction, yet its ability to resist degradation from brake fluid, saltwater spray, and temperature fluctuations makes it far more valuable than its size suggests. Proper fitment is critical—a worn or incorrectly sized O-ring will result in spongy brake feel, fluid weeping, and potential safety issues in an emergency maneuver.

This replacement ring is ideal for boat owners performing brake system maintenance, rebuilding master cylinders after extended service life, or addressing hydraulic fluid leaks that compromise stopping power. Whether you operate a fishing vessel, yacht, or high-performance powerboat, keeping spare Wilwood pushrod retainer rings on hand ensures you can address brake issues quickly without extended downtime. Installation requires draining the brake system and disassembling the master cylinder—work best performed by those comfortable with hydraulic systems—but the payoff is restored brake confidence and safety. Stock this component when overhauling your brake system to ensure proper hydraulic sealing and reliable performance in all sea states.