Wilwood Black Narrow Dynapro Four-Piston Caliper, Thin-Pad Arrangement with 0.25-Inch Rotor Channel

Black powder coat covers the billet housing of this Wilwood Narrow Dynapro caliper. Four 1.12-inch stainless pistons and the thin-pad arrangement accompany a 0.25-inch rotor channel, with an effective piston area of 1.98 square inches. Founded in 1977 by Bill Wood, Wilwood Engineering is based in Camarillo, California. It designs and manufactures disc braking systems for motorsport, street-performance and specialized applications, with a component range covering calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-17628-BK. Type: Narrow Dynapro Radial Mount caliper.
• Construction and surface: billet aluminum, finished in Black Powder Coat.
• Attachment geometry: radial mount with 4.75-inch centers; universal. 0.39-inch holes; 1.61-inch mounting height.
• Bore sequence 1.12/1.12 inches across 4 pistons. Piston construction: stainless steel; specified effective area 1.98 square inches.
• Pad fit uses shape 7812. Match the pad to the rotor and intended operating conditions.
• Rotor dimensions: outside diameter 10.75–12.19 inches; nominal width 0.25 inch, with width limits of 0.25 inch.
• Piston dust boots: no.
• Hydraulic inlet thread: M10 x 1.25. Match the fitting thread and sealing arrangement to the brake hose.
• Component: one individual hydraulic brake caliper. Select the mating rotor, pads, mounting hardware and line connection to suit the complete brake assembly.
• Caliper component weight: approximately 4.1 lb.

Fitment & Compatibility

Check the correct pad thickness and radial bracket before using the caliper on a thin solid rotor. Verify inlet thread and seat geometry at the M10 x 1.25 port, as well as wheel and rotor-hat clearance.

With 20+ years of experience, PMB Performance can help assess the brake hardware. Provide the caliper number, rotor dimensions and bracket measurements when asking about compatibility.