Wilwood 120-14447-P Forged Billet Dynalite Internal Disc Brake Caliper - 4-Piston Polished

The Wilwood 120-14447-P Forged Billet Dynalite Internal is a 4-piston disc brake caliper featuring a polished finish, designed as the next-generation evolution of the proven Forged Dynalite series. Built with a single split bridge and spacer-less construction, this caliper delivers exceptional stiffness and a clean, visually striking appearance suited for both high-performance racing and custom show car builds.

Wilwood's stress-flow forging process re-aligns the metal's grain structure within the contour of the caliper body, eliminating the breaks and interruptions to internal grain structure that occur when machining from a straight billet block. Combined with an FEA-generated radial transition design that removes steps and shoulders between the piston housing and caliper bridges, the result is dramatically increased resistance to deflection and caliper separation under load.

Key Features:

• 4-piston opposed caliper with 1.75" / 1.75" piston bore sizes
• Supports 0.810" maximum rotor disc width
• Lug mount design with universal left/right fitment
• Polished aluminum finish — ideal for custom and show car applications
• Single split bridge, spacer-less design for maximum stiffness and visual appeal
• Stress-flow forged construction for superior grain structure integrity
• FEA-engineered radial transitions eliminate deflection under heavy braking load
• Wilwood SRS stainless steel bridge plates prevent pad gouging and extend caliper life
• SRS spring-loading eliminates pad rattle and reduces braking vibration harmonics
• High-temperature seals and stainless steel pistons resist corrosion and heat transfer
• Internal fluid passages — no external crossover tubes required
• Four-corner bleed screws for simple, effective air evacuation in any mount position
• Direct replacement for Wilwood Dynalite calipers and competitive brands with 5.25" centered mounting lugs
• Compatible with Wilwood 7112 type brake pads — full range of Wilwood pad compounds available

Structural deflection and volume displacement testing confirms this Forged Dynalite Internal outperforms all existing calipers of this popular size class. Reduced deflection and lower fluid volume displacement translate directly to improved clamping efficiency, less pedal travel, and a firmer brake pedal feel.