Wilwood Forged Dynalite Lug-In (FDLI) 4-Piston Caliper – 1.75"/1.75" Bore | 0.50" Rotor | Red | 120-16744-RD

Wilwood’s Forged Dynalite Lug-In (FDLI) 4-piston caliper in 1.75"/1.75" bore configuration for use with 0.50" thick rotors — red finish. The red finish variant of the FDLI 120-16744, providing the same forged billet aluminium caliper construction in a red powder coat finish. Universal fitment — not vehicle-specific. Requires custom bracket fabrication or a purpose-built caliper mount for your specific application.

Wilwood FDLI — What It Is

The Forged Dynalite Lug-In (FDLI) is Wilwood’s forged billet aluminium 4-piston caliper — an evolution of the classic Dynalite design with a lug-in (internal) bridge bolt configuration that provides a stiffer caliper body for more consistent pad clamping and improved brake feel under high-load conditions. The forged aluminium body is significantly lighter than cast iron OEM calipers while providing the structural rigidity required for high-performance braking. The FDLI is a staple of custom brake kit builds across formula racing, kit cars, open wheel applications, and high-performance street and track builds where a purpose-built brake package is being assembled from components.

Specification Breakdown

• FDLI (Forged Dynalite Lug-In): Forged billet aluminium body with internal (lug-in) bridge bolt configuration — stiffer than external bridge bolt designs, providing more consistent pad clamping and improved pedal feel under sustained braking loads
• 1.75"/1.75" Bore: Four pistons total — two pistons per side, each 1.75" diameter. The equal bore configuration provides balanced clamping force across the full pad face. Confirm this caliper’s piston area is appropriate for your brake system’s master cylinder bore and target brake bias
• 0.50" Rotor Thickness: Designed for use with 0.50" (half-inch) thick rotors — a thin rotor specification common in lightweight formula and open wheel applications. Confirm your rotor thickness matches this caliper’s pad gap before ordering
• Red Finish: Red powder coat finish — the classic high-visibility caliper colour widely used in motorsport and performance brake builds. Same caliper construction and performance specifications as the anodized (120-16744) and black (120-16744-BK) finish variants

Key Features

• Forged Billet Aluminium Body: Forged aluminium construction provides high strength-to-weight ratio — significantly lighter than cast iron OEM calipers while maintaining the structural rigidity required for high-performance braking
• 4-Piston Opposed Design: Four opposed pistons provide even clamping force across the full brake pad face — more consistent pad wear and more linear brake feel compared to single or floating piston designs
• Lug-In Bridge Bolt: Internal bridge bolt configuration stiffens the caliper body under load — reducing caliper flex and maintaining consistent pad-to-rotor contact under high braking forces
• Wilwood Engineering: Wilwood is one of the most established performance brake manufacturers in the US — with decades of experience supplying brake components for NASCAR, IndyCar, IMSA, and a wide range of motorsport and high-performance street applications

Application

Universal — not vehicle-specific. Designed for custom brake system builds including:

• Formula and open wheel race cars
• Kit cars and purpose-built race vehicles
• Custom brake kit builds on modified street and track cars
• Any application requiring a lightweight, high-performance 4-piston caliper for a 0.50" rotor

Universal fitment — requires custom bracket fabrication or a purpose-built caliper mount for your specific application. Confirm rotor thickness (0.50"), pad compatibility, and brake system master cylinder sizing before ordering. Sold individually (single caliper) unless otherwise specified — confirm quantity before ordering. A complete brake system requires matching rotor, pads, master cylinder, and brake lines sized for this caliper’s piston area and your target brake bias. Professional brake system design and installation is strongly recommended.

Specifications

• Brand: Wilwood
• Part Number: 120-16744-RD
• Series: Forged Dynalite Lug-In (FDLI)
• Piston Configuration: 4-Piston Opposed
• Bore: 1.75" / 1.75" (equal bore)
• Rotor Thickness: 0.50"
• Finish: Red
• Body Material: Forged Billet Aluminium
• Weight: 3.55 lbs
• Application: Universal — Custom Brake Builds

Note: Brake system design for race and high-performance applications requires careful matching of caliper piston area, master cylinder bore, rotor size and thickness, and brake bias. If you are building a complete brake system, consult Wilwood’s technical resources or a qualified brake system engineer to confirm component compatibility before ordering.