Wilwood Dynalite Internal Caliper with Polished Body, Four 1.75-Inch Pistons and 5.25-Inch Lug Spacing

Match this polished Wilwood Forged Dynalite Internal to a brake assembly requiring 0.81-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: 120-13844-P
• Component: Wilwood Forged Dynalite Internal; 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: 0.81-inch nominal; 0.75–0.83-inch permitted range
• Rotor diameter range: 10.00–13.06 inches
• Pad shape: Wilwood type 7112; compound selected separately
• Body and finish: Forged aluminum; Polish
• Fluid inlet: 1/8-27 NPT
• Dust boots: No
• Mount height: 2.03 inches

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.

PMB Performance has worked with parts and brake fitment for over 20 years. Supply the installed caliper identity and the rotor and bracket measurements for a practical compatibility check.