Wilwood Type III Anodized Billet Narrow Dynalite Radial Brake Caliper: 0.81-Inch-wide Rotor, 1.38-Inch Bore and 4.75-Inch Centers

The Wilwood Billet Narrow Dynalite Radial shown here is specified for 0.81-inch rotor width, 4.75-inch radial mounting and 1.38-inch piston bores. This Type III anodized 4-piston component is selected by brake-system geometry rather than vehicle year alone. Founded in 1977 by Bill Wood, Camarillo, California-based Wilwood Engineering manufactures disc brake components for motorsport, street-performance and specialized uses. Its range covers calipers, rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-15563-SI
• Mounting: universal side configuration; Radial; 4.75-inch centers; 0.39-inch mounting holes
• Mount height: 1.24 inches
• Rotor width: 0.81-inch nominal; 0.75–0.81-inch permitted range
• Rotor diameter range: 11.75–12.19 inches
• Pad shape: Wilwood types 7816 / 7216; compound selected separately
• Piston arrangement: 4 pistons; 1.38-inch bores; stainless steel
• Hydraulic piston area: 3.00 square inches, as specified by Wilwood
• Body and finish: Billet aluminum; Type III anodized
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Component: Wilwood Billet Narrow Dynalite Radial; one caliper

Fitment & Compatibility

Select pads by the specified friction shape and intended operating temperature. Check the wheel template with the actual rotor, hat and bracket before finalizing the installation.

This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.

The Billet Narrow Dynalite radial caliper uses four stainless pistons, internal fluid transfer and type 7816 pads. Its 4.75-inch stud spacing differs from the 3.50-inch lug-mount Narrow Dynalite layout.

PMB Performance has worked with parts and brake fitment for over 20 years. Supply the installed caliper identity and the rotor and bracket measurements for a practical compatibility check.