Wilwood Red Narrow Dynapro Radial 4-Piston Caliper, 0.81-Inch Rotor Width

The Wilwood Narrow Dynapro Radial shown here is specified for 0.81-inch rotor width, 4.75-inch radial mounting and 1.12-inch piston bores. This red 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.

This narrow four-piston Dynapro uses a 4.75-inch radial pattern and type 7812 pads. The compact body must still clear the wheel and rotor hat, with the bracket locating the pad sweep correctly on the rotor.

Technical Details

• Manufacturer part number: 120-14091-RD
• Component: Wilwood Narrow Dynapro Radial; one caliper
• Body and finish: Billet aluminum; Red Powder Coat
• Dust boots: No
• Piston arrangement: 4 pistons; 1.12-inch bores; stainless steel
• Hydraulic piston area: 1.98 square inches, as specified by Wilwood
• Mounting: universal side configuration; Radial; 4.75-inch centers; 0.39-inch mounting holes
• Mount height: 1.61 inches
• Fluid inlet: 1/8-27 NPT
• Pad shape: Wilwood type 7812; compound selected separately
• Rotor width: 0.81-inch nominal; 0.75–0.86-inch permitted range
• Rotor diameter range: 11.75–12.88 inches

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.

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.