Wilwood Dynapro Narrow 4-Piston Caliper in Type III Anodized, 5.25-Inch Lug Attachment

The Narrow Lug Mount Dynapro is shaped around a reduced outboard profile, making rotor-hat and wheel clearance central to component selection. Four equal 1.75-inch stainless pistons provide 4.80 square inches of hydraulic area in this Type III anodized, forged caliper. It uses a nominal 0.38-inch rotor-width channel and a 5.25-inch lug pattern, rather than a vehicle-specific conversion supplied as a complete kit. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company makes disc brake systems and components, including calipers, rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.

This narrower-outboard-profile Dynapro uses four pistons with a 5.25-inch lug pattern. Top-access type 7812 pads and internal fluid passages support service, but the reduced profile must be checked against the actual wheel and rotor-hat dimensions.

Technical Details

• Manufacturer part number: 120-15374
• Component: Wilwood Dynapro Narrow Lug Mount; one caliper
• Mounting: universal side configuration; Lug; 5.25-inch centers; 0.39-inch mounting holes
• Piston arrangement: 4 pistons; 1.75-inch bores; stainless steel
• Hydraulic piston area: 4.80 square inches, as specified by Wilwood
• Rotor width: 0.38-inch nominal; 0.31–0.42-inch permitted range
• Rotor diameter range: 10.00–13.06 inches
• Pad shape: Wilwood type 7812; compound selected separately
• Body and finish: Forged aluminum; Type III anodized
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Mount height: 2.10 inches

Fitment & Compatibility

Measure the available space beside the rotor hat and compare it with the caliper drawing; the narrow body does not guarantee wheel clearance. This version requires a rotor within the listed 0.31–0.42-inch width and 10.00–13.06-inch diameter ranges, together with correct 5.25-inch lug spacing and mounting offset. Check pad sweep, the 1/8-27 NPT hose connection and the required piston area before substituting it for another Dynapro.

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

PMB Performance has over 20 years of brake and parts experience. Send us the caliper specifications, rotor measurements and bracket details if you need help selecting the correct component.