Wilwood 120-13839 Forged Dynalite 4-Piston Caliper 1.38" Pistons .81" Disc

Vehicle Fitment

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

Features

• Wilwood Forged Dynalite internal 4-piston caliper design for strength and reduced deflection
• Four 1.38" (35.1 mm) stainless steel pistons for balanced pad loading
• Compact body optimized for space-constrained installations
• Designed for use with discs up to .81" (20.6 mm) thickness
• Type III hard-anodized finish for enhanced corrosion resistance
• Universal lug-mount compatibility for flexible left/right mounting
• Accepts widely available performance pad styles for customization
• Lightweight forged aluminum construction improves unsprung weight

Specifications

• Part Number: 120-13839
• Caliper Type: Forged Dynalite internal 4-piston
• Piston Diameter: Four 1.38" (35.1 mm) stainless steel
• Disc Compatibility: Up to .81" (20.6 mm) thickness
• Pad Area: ~6.36 in²
• Pad Volume: ~2.1 in³
• Mount Style: Universal lug mount (approx. standard spacing)
• Finish: Type III hard-anodized aluminum
• Approx. Weight: ~3.6 lbs (1.63 kg) per caliper
• Inlet Thread: 1/8-27 NPT (female)

Included Components

• 1x Wilwood 120-13839 Forged Dynalite 4-piston caliper

Product Description

The Wilwood 120-13839 Forged Dynalite 4-piston caliper is a high-performance brake caliper engineered for custom brake systems, race cars, kit cars, and performance vehicles where compact size and strong stopping power are needed. Featuring four 1.38" stainless steel pistons and a forged aluminum body with advanced stress-flow forging, this caliper offers balanced pad contact, improved rigidity, and reduced deflection under demanding braking conditions. The Type III hard-anodized finish adds corrosion resistance and long service life.

Designed for universal lug-mount applications, the 120-13839 is compatible with discs up to .81" thick and works with a wide range of common performance brake pads, giving builders and fabricators flexibility when designing or upgrading braking systems. Its lightweight construction helps reduce unsprung weight, improving overall suspension performance. Brake pads, mounting adapters/brackets, hoses, and hardware are sold separately and must be matched to your specific vehicle or custom setup.