Rebuild Kit 3/4in

The Wilwood Rebuild Kit 3/4in (MPN 260-6898) is an essential service component for restoring master cylinder function on brake systems equipped with Wilwood 3/4-inch bore cylinders. When a brake system exhibits soft pedal feel, reduced braking response, or internal leakage, this rebuild kit provides all internal seals and components needed to return the master cylinder to original specifications without replacing the entire assembly. This is a critical maintenance item for street-driven vehicles, race cars, and vintage restorations where precision brake architecture matters.

This kit includes a complete set of OEM-specification seals, the replacement piston assembly, pushrod, snap ring, and both the dust boot and lid gasket—everything needed to disassemble, clean, and reassemble the master cylinder bore without secondary damage. Wilwood uses premium elastomer compounds in the seal set to withstand high-pressure cycles and fluid compatibility across DOT 3, 4, and 5.1 brake fluids. The 3/4-inch bore size accommodates mid-range hydraulic pressure circuits common in street performance and light-duty competition applications, offering a balance between pedal feel and braking force multiplication across typical brake line configurations.

Technicians and brake specialists prefer this rebuild approach for Wilwood master cylinders because it eliminates downtime versus complete cylinder replacement and costs significantly less while maintaining full functionality. The kit is ideal for DIY brake system maintenance, professional shop applications, and any build where the original bore diameter and mounting interface must remain unchanged. Proper installation requires basic mechanical skill, a clean work area, and bench tools—no special equipment necessary, making this a practical solution for both amateur and professional brake work.