Wilwood Type III Anodized Dynalite Internal Brake Caliper, 1.00-Inch Rotor Width

For a brake system using a 1.00-inch-wide rotor, this Type III anodized Wilwood Forged Dynalite Internal provides 4 pistons with 1.38-inch bores. The caliper attaches on 5.25-inch lug centers. 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: 120-13840
• Component: Wilwood Forged Dynalite Internal; one caliper
• Rotor width: 1.00-inch nominal; 0.94–1.04-inch permitted range
• Rotor diameter range: 10.00–13.06 inches
• Mounting: universal side configuration; Lug; 5.25-inch centers; 0.39-inch mounting holes
• Mount height: 2.03 inches
• Piston arrangement: 4 pistons; 1.38-inch bores; stainless steel
• Hydraulic piston area: 3.00 square inches, as specified by Wilwood
• Pad shape: Wilwood type 7112; compound selected separately
• Body and finish: Forged aluminum; Type III anodized
• Dust boots: No
• Fluid inlet: 1/8-27 NPT

This four-piston Dynalite uses internal fluid transfer in a spacerless body. Its 5.25-inch mounting pattern is only one compatibility dimension: rotor position, body clearance and hydraulic area also need to agree.

Fitment & Compatibility

Measure rotor width before comparing calipers. Verify the mount height, rotor centerline and available wheel space; a common piston count does not establish interchangeability.

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

With over 20 years of experience, PMB Performance can help compare piston configuration and mounting geometry. Share the existing brake package and measured rotor dimensions before ordering.