Wilwood 120-13405-SI Billet Narrow Dynalite 4-Piston Radial Mount Caliper

Vehicle Fitment

• Universal fitment - Radial mount performance brake caliper for custom and racing applications

Features

• Billet Narrow Dynalite Radial Mount caliper design for compact performance use
• Forged aluminum body with internal fluid ports and Type III hard-anodized finish
• Four 1.75" stainless steel pistons for reliable clamping force and smooth modulation
• Radial mounting system for increased rigidity compared to traditional tab-mount designs
• Designed for .38" (9.7 mm) thick rotors up to ~12.19" diameter
• Accepts standard 7816 brake pad style with various compound options available
• Two corner-bleed ports and outboard inlet for practical installation
• Lightweight design (~3.2 lbs) ideal for sprint, midget, late model, and custom applications

Specifications

• Part Number: 120-13405-SI
• Caliper Type: Billet Narrow Dynalite Radial Mount, 4-piston
• Caliper Finish: Type III hard-anodized aluminum
• Piston Diameter: 1.75" (44.5 mm) stainless steel
• Total Piston Area: ~4.80 in²
• Rotor Thickness Supported: 0.32"-0.38" (8.1-9.7 mm)
• Maximum Rotor Diameter: ~12.19" (310 mm)
• Pad Area: ~6.36 in²; Pad Volume: ~3 in³
• Mount Type: Radial mount, universal left/right
• Mount Center: ~4.75"
• Inlet Thread: 1/8-27 NPT (female)
• Approx Weight: ~3.2 lbs (1.45 kg)

Included Components

• 1x Wilwood 120-13405-SI Billet Narrow Dynalite 4-piston radial mount caliper (anodized)

Product Description

The Wilwood 120-13405-SI is a high-performance Billet Narrow Dynalite radial mount brake caliper engineered for universal custom and racing applications. Its compact, lightweight design and radial mounting configuration provide increased stiffness and more consistent braking force compared to traditional tab-mount calipers. Constructed from CNC-machined aluminum with a durable Type III hard-anodized finish, this caliper delivers improved durability and long service life in demanding environments. The four 1.75" stainless steel pistons offer balanced pad contact and dependable modulation for spirited driving and competitive use.

Designed to work with rotors up to approximately 12.19" in diameter and 0.38" thick, the 120-13405-SI accepts standard 7816 style brake pads, which are available in a range of compound options to suit different performance goals. As a universal radial mount caliper, it can be fitted with appropriate bracket kits or custom setups for inboard or outboard applications on sprint cars, midgets, dirt late models, or other specialty vehicles. Brake brackets, pads, and hardware are not included and must be sourced separately.