Wilwood 120-13843 Forged Dynalite Internal 4-Piston Caliper (.38", Lug Mount)

Vehicle Fitment

• Universal application -- bolt-on for vehicles using standard lug-mount caliper mounts

Fitment Notes

• Mounts via 5.25" lug-mount pattern; fits 10" to 13" rotors (min Ø10", max Ø13")
• Designed for .38" (10 mm) thick rotors with 7112-style pads
• Requires individual wheel clearance check--use 15"+ wheels typically
• Pair kit with compatible stainless flexlines and rotors

Features

• Forged billet, stress-flow 4-piston body for superior strength and rigidity
• Spacer-less split bridge design resists deflection under heavy load
• Stainless steel pistons and dust seals packed for reliability
• Support for Wilwood 7112 brake pads (BP-10 compound)
• Lug-mount design ensures bolt-on compatibility with OEM spindles/hubs
• Lightweight (~3-3.6 lb) for unsprung mass reduction
• Available finishes: Type III anodized, polished, black, red
• Wilwood durability tested -- proven in drag and performance applications

Specifications

• Part Number: 120-13843
• Pistons: 2 x 1.75" per side (4 total)
• Piston Area: 4.80 in²
• Rotor Width Capacity: 0.25-0.38"
• Pad Plate: 7112 style; area: 6.36 in²; volume: 2.1 in³
• Mount Pattern: Lug mount, 5.25" center, 0.39" hole
• Material: Forged aluminum, stainless internals

Included Components

• 1x Wilwood 120-13843 Forged Dynalite Internal caliper
• 2x Stainless steel pistons (1.75")
• 1x Dust seal kit installed
• 1x Bleeder screw
• 1x Hardware kit (pins, bolts, bleeder cover)

Product Description

The Wilwood 120-13843 Forged Dynalite Internal caliper is a high-performance, 4-piston lug-mount option designed to upgrade braking on a wide range of vehicles. Featuring a forged billet body and split-bridge design, it offers exceptional strength, stiffness, and lightweight performance--ideal for drag racing, street, and track builds.

This .38" rotor-compatible caliper accepts popular Wilwood 7112 brake pads and fits wheels with 15" or larger diameters. The lug-mount design allows for bolt-on installation using existing spindles and hubs, while the forged-stainless piston assembly ensures smooth, consistent performance under repeated heavy use.

Available in multiple finishes--Type III anodized, polished, red, or black--it provides both functional upgrades and aesthetic appeal. Fully sealed, performance-tested, and built with Wilwood quality standards, the 120-13843 is a proven solution for enthusiasts seeking lightweight strength and braking precision.