Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
The BSL mixed square-ring kit contains four piston seals in the listed 1.750/1.380-inch ID arrangement. The pressure rings use the 0.099-inch section specified by Wilwood. It is the service pack for a matching caliper configuration, with both size groups needing correct placement during repair. 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: 130-5101
- Service component: Caliper Square Ring Kit
- Seal profile: Square-Ring
- Manufacturer-listed seal inside diameters: 1.750 / 1.380 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 full BSL caliper identity and its assigned kit before ordering. Match groove profile and ring thickness in addition to the diameter sequence. Inspect piston surfaces, bores and other sealing locations separately; replacing the four supplied pressure rings is not the same as renewing every caliper component.
PMB Performance has over 20 years of experience helping customers with brake and parts fitment. Share the installed component identification and relevant measurements when requesting assistance.
