Wilwood Polished Forged Dynalite Internal Dust Seal 4-Piston Caliper, 0.81-Inch Rotor Width

This polished Wilwood Forged Dynalite Internal Dust Seal adds piston dust protection to the four-piston Dynalite Internal arrangement. Four 1.75-inch stainless pistons operate in a forged aluminum body with internal fluid transfer. The specified nominal 0.81-inch rotor width and 5.25-inch lug pattern must match the brake assembly; the polished finish is a separate selection detail. 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.

Piston dust wipers distinguish this sealed four-piston Dynalite Internal from the unsealed model. Its spacerless body and internal fluid transfer are matched to type 7112 pads and the selected rotor-width capacity.

Technical Details

• Manufacturer part number: 120-14447-P
• Component: Wilwood Forged Dynalite Internal Dust Seal; one caliper
• Body and finish: Forged aluminum; Polish
• Dust boots: Yes
• Piston arrangement: 4 pistons; 1.75-inch bores; stainless steel
• Hydraulic piston area: 4.80 square inches, as specified by Wilwood
• Mounting: universal side configuration; Lug; 5.25-inch centers; 0.39-inch mounting holes
• Mount height: 2.03 inches
• Fluid inlet: 1/8-27 NPT
• Pad shape: Wilwood type 7112; compound selected separately
• Rotor width: 0.81-inch nominal; 0.75–0.83-inch permitted range
• Rotor diameter range: 10.00–13.06 inches

Fitment & Compatibility

Type 7112 pads and a rotor within the 10.00–13.06-inch diameter envelope establish the required friction geometry. Measure rotor width against the 0.75–0.83-inch permitted range, then locate the caliper from its 2.03-inch mount height and the actual disc centerline. Leave room for the hose fitting and upper bleeders while checking the complete wheel envelope.

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

PMB Performance’s team has over 20 years of experience with brake components and fitment. We can help review this caliper against the dimensions and hydraulic requirements of your brake system.