Wilwood Red Right Six-Piston FNSL6R Caliper, 1.25-Inch Rotor Width / 5.98-Inch Mount

The red right FNSL6R uses differential stainless pistons and a narrow 7416 pad arrangement. Its nominal rotor width is 1.25 inches, with a 4.04-square-inch effective piston area in the forged radial body. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. It designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.

Technical Details

• Manufacturer part number: 120-11778-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.
• Mounting: radial, 5.98-inch centers; right hand orientation. Mount holes: 0.39 inch; height: 1.45 inches.
• Piston dust boots: not fitted.
• Pistons: 6 stainless steel; bore specification: 1.62/1.12/1.12 inches. Effective piston area: 4.04 sq in.
• Caliper weight: approximately 5.0 lb.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Rotor compatibility: nominal width 1.25 inch; diameter 11.75–14.00 inches. Specified rotor-width limits: 1.19–1.25 inch.
• Body: forged aluminum; finish: Red powder coat.
• Compatible brake pad shape: 7416; choose the required compound for the brake system.

Fitment & Compatibility

Match the 5.98-inch bracket to the rotor centerline and specified hand. Wheel clearance must be checked with the caliper in its actual position, not inferred from the rotor diameter alone.

PMB Performance has over 20 years of brake-component experience. Send the existing caliper identification, rotor measurements and bracket details for help matching this configuration.