Wilwood Forged Dynalite Internal Caliper with Stainless Steel Pistons, Type III Anodized, 0.38-Inch-wide Rotor

Match this Type III anodized Wilwood Forged Dynalite Internal to a brake assembly requiring 0.38-inch rotor width and 1.75-inch pistons. The 4-piston caliper uses 5.25-inch lug mounting rather than a vehicle-specific adapter supplied as a kit. Wilwood Engineering’s disc brake range includes calipers, rotors, master cylinders, valves, fittings and brake lines. Bill Wood founded the company in 1977 in California; it is based in Camarillo and serves motorsport, street-performance and specialized brake applications.

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.

Technical Details

• Manufacturer part number: 120-13843
• Component: Wilwood Forged Dynalite Internal; one caliper
• Piston arrangement: 4 pistons; 1.75-inch bores; stainless steel
• Hydraulic piston area: 4.80 square inches, as specified by Wilwood
• Pad shape: Wilwood type 7112; compound selected separately
• Mounting: universal side configuration; Lug; 5.25-inch centers; 0.39-inch mounting holes
• Mount height: 2.03 inches
• Rotor width: 0.38-inch nominal; 0.25–0.38-inch permitted range
• Rotor diameter range: 10.00–13.06 inches
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Body and finish: Forged aluminum; Type III anodized

Fitment & Compatibility

Identify the existing mounting bracket and compare its caliper centerline, hole spacing and radial position. Verify the piston configuration against the hydraulic system specification.

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.