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Product details
The mixed square-ring pack supplies four piston seals with listed IDs of 1.250 and 1.000 inches. Wilwood assigns this combination to specific BSL4R and IRGT-4R configurations. The smaller size pair distinguishes the kit from other four-piston packs that may share the same external caliper family. Founded in 1977 by Bill Wood, Wilwood Engineering is based in Camarillo, California. Its disc brake systems and components serve motorsport, street-performance and specialized applications. Calipers, brake rotors, master cylinders, valves, fittings and brake lines are among its products, selected according to the complete brake system’s requirements.
Technical Details
- Manufacturer part number: 130-7219
- Service component: Caliper Square Ring Kit
- Seal profile: Square-Ring
- Manufacturer-listed seal inside diameters: 1.250 / 1.000 inches
- Listed seal thickness: 0.099 inch
- Manufacturer material code: 210M
- Pack quantity: 4 Pack
- Seal fluid compatibility: DOT 3, DOT 4 and DOT 5 as specified for these seals. Follow the complete caliper and vehicle fluid requirements; do not mix silicone DOT 5 with DOT 3, DOT 4 or DOT 5.1.
Fitment & Compatibility
Confirm the exact caliper service kit and keep the larger and smaller locations identified throughout the repair. Check ring section and groove shape at each piston. The pack’s four pieces do not imply axle coverage or include all other dust protection, crossover sealing and hardware that a damaged caliper might require.
PMB Performance brings over 20 years of brake and parts experience to selection questions. Send the existing caliper reference and brake-package details for help checking compatibility.
