Wilwood 120-12502 Forged Dynalite Disc Brake Caliper - 4-Piston

The Wilwood 120-12502 Forged Dynalite Caliper is a high-performance, 4-piston fixed disc brake caliper engineered for broad motorsports applications. It serves as the foundation caliper in the majority of Wilwood's Bolt-On Disc Brake Kits, combining race-proven design with advanced forging technology for superior strength and braking efficiency.

Stress-Flow Forged Construction:

Unlike calipers machined from straight billet blocks, the Forged Dynalite is produced using a stress-flow forging process that re-aligns the metal's internal grain structure to follow the contour of the caliper body. This eliminates the grain interruptions inherent in conventional billet machining, resulting in a caliper body that is stronger and more resistant to fatigue — with weights starting at just 2.80 pounds.

FEA-Optimized Radial Transition Design:

Finite Element Analysis (FEA) was used to develop a radial transition between the piston housing body and the caliper bridges, eliminating stress-concentrating steps and shoulders in this critical area. The incorporated radius substantially increases resistance to deflection and caliper separation under braking load. The result is reduced fluid volume displacement, greater clamping efficiency, less pedal travel, and a taller, more confident brake pedal feel.

Key Features:

• SRS Stainless Steel Bridge Plates — Prevent pad gouging wear on caliper bridges, extend service life, eliminate pad rattle, and dampen vibration harmonics that contribute to brake squeal
• Stainless Steel Pistons — Resist corrosion and retard heat transfer from brake pads to caliper fluid
• High-Temperature Seals — Engineered for sustained performance in demanding race and high-performance street environments
• Internal Fluid Passages — Eliminate the need for external brake lines or tubes between caliper halves
• Four-Corner Bleed Screws — Allow complete air evacuation and enable universal mounting in any front, rear, left, or right position with a single caliper
• 1/8-27 NPT Inlet — Standard thread size for easy brake line connection
• Bright Black Anodized Finish — Corrosion-resistant finish standard on race calipers; polished finish available for show car applications
• 7112 Brake Pad Compatibility — Direct drop-in for all pads used in earlier Dynalite versions; full range of Wilwood compounds available to match heat range and response requirements

The Wilwood 120-12502 Forged Dynalite is a direct replacement for all Wilwood Dynalite and competitive calipers with 5.25" centered mounting lugs, making it a straightforward upgrade path for existing setups. Structural deflection and volume displacement testing confirms the Forged Dynalite outperforms all comparable calipers in its class.