Wilwood Narrow Dynapro Brake Caliper with 1.12-Inch Pistons, Black Radial Body

Choose this Wilwood Narrow Dynapro Radial when the installation calls for 1.12-inch pistons and 0.81-inch rotor width. The black 4-piston body uses a 4.75-inch radial pattern; check its complete geometry before substituting another caliper. Bill Wood founded Wilwood Engineering in 1977. Based in Camarillo, California, Wilwood designs and manufactures disc brake systems and parts for motorsport, street-performance and specialized applications, from calipers and rotors to 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-BK
• Component: Wilwood Narrow Dynapro Radial; one caliper
• Piston arrangement: 4 pistons; 1.12-inch bores; stainless steel
• Hydraulic piston area: 1.98 square inches, as specified by Wilwood
• Pad shape: Wilwood type 7812; compound selected separately
• Mounting: universal side configuration; Radial; 4.75-inch centers; 0.39-inch mounting holes
• Mount height: 1.61 inches
• Rotor width: 0.81-inch nominal; 0.75–0.86-inch permitted range
• Rotor diameter range: 11.75–12.88 inches
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Body and finish: Billet aluminum; Black Powder Coat

Fitment & Compatibility

Use the caliper drawing to compare the mounting holes and body envelope with the installed brake assembly. Confirm piston sizes and brake balance before changing to a different bore configuration.

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

For a brake system assembled from individual components, PMB Performance brings over 20 years of experience. Contact us with the rotor, caliper and bracket information so we can help check the combination.