Wilwood Forged Dynalite Internal, 4-Piston Lug Brake Caliper, Black, 1.75-Inch Bore for 1.00-Inch-wide Rotor

Match this black Wilwood Forged Dynalite Internal to a brake assembly requiring 1.00-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.

Technical Details

• Manufacturer part number: 120-13845-BK
• Component: Wilwood Forged Dynalite Internal; one caliper
• Pad shape: Wilwood type 7112; compound selected separately
• 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; 1.75-inch bores; stainless steel
• Hydraulic piston area: 4.80 square inches, as specified by Wilwood
• Fluid inlet: 1/8-27 NPT
• Body and finish: Forged aluminum; Black Powder Coat
• Dust boots: No

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

Set up the brake assembly around the specified rotor and pad geometry. Check the mount drawing and wheel envelope, and confirm that the piston area suits the rest of the hydraulic system.

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.