Bridge Bolt Kit FSL4 1.25in Rotor

The Wilwood Bridge Bolt Kit FSL4 1.25in Rotor is a precision brake caliper assembly component designed for high-performance and tactical vehicle platforms requiring reliable hydraulic stopping power. This kit serves operators and technicians who demand mil-spec repeatability in braking systems, whether for law enforcement pursuit vehicles, military transport, or competition platforms. The bridge bolt assembly is the critical load-bearing interface between caliper housing and rotor, engineered to withstand sustained thermal cycling and extreme deceleration forces.

The FSL4 kit features 1/4-20 threaded fasteners machined to 4.5 inches in length, utilizing Allen head socket cap screws for secure, tool-friendly installation and maintenance in field conditions. This configuration is compatible with 1.25-inch rotor systems and delivers consistent clamping pressure across the brake pad friction surface, translating to predictable stopping distances and fade-resistant performance under sustained braking demands. The precision-machined specifications ensure zero lateral runout and eliminate brake chatter, critical factors for tactical platforms where vehicle control cannot be compromised. Weighing only 0.27 lbs, the kit maintains minimal unsprung mass while delivering full structural integrity required for law enforcement and military applications.

This bridge bolt kit is essential for technicians replacing or servicing Wilwood brake calipers on 1.25-inch rotor assemblies, ensuring OEM-equivalent performance and longevity. Installation requires standard hex wrenches and is compatible with existing Wilwood FSL4 caliper housings. The Allen head design provides superior grip and reduces fastener stripping during removal and reinstallation cycles. For departments and operators maintaining high-use tactical vehicles, keeping replacement bridge bolt kits in inventory prevents extended downtime and maintains fleet readiness. Professional installation is recommended to verify proper torque specifications and caliper alignment.