Wilwood FNDL Small-Bore Caliper, 0.81-Inch Rotor Width / Type III / 1.12-Inch Pistons

This anodized Narrow Dynalite is configured for a nominal 0.81-inch rotor width with four small 1.12-inch stainless pistons. Internal fluid passages connect the two halves of its compact forged body. Bill Wood established Wilwood Engineering in 1977. Based in Camarillo, California, the company designs and manufactures disc brake systems, from calipers and brake rotors to master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized use.

Technical Details

• Manufacturer part number: 120-11578. Component: Forged Narrow Dynalite caliper.
• Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
• Hydraulic inlet thread: 1/8-27 NPT. Use a fitting with the correct thread and sealing seat.
• Nominal rotor width 0.81 inch; compatible outside diameter from 11.75 through 12.72 inches. Specified rotor-width limits: 0.75–0.81 inch.
• Construction and surface: forged aluminum housing finished in Type III anodize.
• Piston dust boots: not fitted.
• Bore configuration 1.12 inches across 4 pistons; piston material: stainless steel. Hydraulic effective area: 1.98 square inches.
• Pad fit is type 7816; 7216. Match the pad dimensions and compound to the rotor and intended braking conditions.
• Caliper weight: approximately 4.1 lb.
• Bracket interface: 3.50-inch lug centers with 0.45-inch holes. Specified mount height: 2.85 inches; orientation: universal.

Fitment & Compatibility

Select the 1.98-square-inch effective area deliberately. Confirm 3.50-inch mounting centers and the 7816/7216 pad sweep rather than using only the Narrow Dynalite name to identify a replacement.

With 20+ years of experience, PMB Performance can help compare the actual brake hardware. Supply the caliper number, rotor dimensions and mounting measurements when asking about compatibility.