Square O-Ring Kit - 1.38

The Square O-Ring Kit - 1.38 by WILWOOD is a precision brake caliper rebuild component engineered for law enforcement, military, and tactical operators who demand reliable stopping power under extreme conditions. This OEM-grade rubber seal kit is purpose-built to restore hydraulic integrity to Wilwood piston brake calipers, ensuring consistent brake pressure and eliminating fluid weep that compromises safety. Whether you're maintaining duty vehicles, tactical platforms, or high-performance equipment in field environments, this kit delivers the exact replacement seals required for professional-grade brake system restoration.

The 1.38-inch square O-ring configuration is engineered to match Wilwood piston bore specifications, providing a hermetic seal that prevents hydraulic fluid loss and maintains caliper clamping force under sustained braking loads. Constructed from premium elastomer compounds resistant to brake fluid, heat cycling, and pressure spikes, these seals maintain their dimensional tolerances across the temperature ranges encountered in tactical and law enforcement applications. The compact kit design—weighing just 0.05 lbs—makes it ideal for field repair kits, vehicle maintenance lockers, or professional shop inventory, while the standardized 1.38-inch diameter ensures drop-in compatibility with Wilwood's lineup of tactical and performance brake systems.

Brake system failures during mission-critical operations are unacceptable, making this Square O-Ring Kit essential for duty vehicles, tactical response platforms, and specialty equipment requiring Wilwood caliper systems. Installation requires basic mechanical competency and standard brake service protocols—drain the caliper, remove the piston, and install new seals following Wilwood's rebuild specifications. This kit is mission-critical for mechanics, armorer-level technicians, and fleet maintenance personnel supporting law enforcement and military operations who cannot afford downtime or brake system compromise.