Wilwood Red FNSL6R Left Six-Piston Caliper, 1.38/1.12/1.12-Inch Bores

This red left Narrow Superlite 6 uses six differential stainless pistons with a 3.46-square-inch effective area. The nominal 1.10-inch rotor width and 7416 pad geometry define its brake-package requirements. Bill Wood founded Wilwood Engineering in 1977, and the company is based in Camarillo, California. It designs and manufactures disc brake systems and a component range of calipers, brake rotors, master cylinders, valves, fittings and brake lines serving motorsport, street-performance and specialized installations.

Technical Details

• Manufacturer part number: 120-12003-RD. Component: Forged Narrow Superlite 6 Radial Mount caliper.
• Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
• Rotor compatibility: nominal width 1.10 inch; diameter 11.75–14.00 inches. Specified rotor-width limits: 1.00–1.10 inch.
• Mounting: radial, 5.98-inch centers; left hand orientation. Mount holes: 0.39 inch; height: 1.45 inches.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Piston dust boots: not fitted.
• Compatible brake pad shape: 7416; choose the required compound for the brake system.
• Pistons: 6 stainless steel; bore specification: 1.38/1.12/1.12 inches. Effective piston area: 3.46 sq in.
• Body: forged aluminum; finish: Red powder coat.
• Caliper weight: approximately 5.0 lb.

Fitment & Compatibility

Keep the specified left-hand orientation. Compare the 5.98-inch radial mount and rotor centerline with the actual assembly, then check that the hydraulic system suits the smaller FNSL6R bore combination.

For a replacement or custom installation, send PMB Performance the brake dimensions and existing component identification. Our 20+ years of experience can help narrow down the correct combination.