Wilwood 140-12557-D Dynapro Dual-Caliper Rear Dynamic Drag Brake Kit SA Drilled 11.44"

The Wilwood 140-12557-D is a Billet Dynapro Lug-Drive Dual-Caliper Rear Dynamic Brake Kit featuring stainless super alloy drilled rotors. Engineered for high-performance drag racing and street/strip applications, this kit is purpose-built for vehicles that place heavy demands on rear braking — including high-speed, heavyweight builds that generate above-average rear brake heat.

Lug-Drive Dynamic Rotor System:

• Bolt-free rotor mounting — a large single internal snap-ring retains the rotor in the hat, eliminating rotor bolts entirely for faster, easier assembly and installation
• Thermally independent rotor movement — rotors float freely within the hat, expanding and contracting through heat cycles without transferring thermal stress to the attachment points
• Flatter, truer rotors — by removing all thermally generated stress from the rotor attachment points, rotors maintain better dimensional stability under extreme heat
• Protected billet aluminum hats — spring-loaded, replaceable stainless steel inserts in each lug-drive slot shield the aluminum hat from wear caused by brake torque loading
• Distortion-free hat design — hats are no longer subject to deformation from rotor thermal expansion and shrinkage cycles

Kit Specifications:

• Rotor diameter: 11.44" (standard diameter; a 11.25" version is also available for bead lock rim clearance)
• Rotor finish: SA Drilled stainless super alloy
• Caliper configuration: Dual caliper (DPL — Dynapro Lug-Mount)
• Stud size: .690" studs with M-W / Lamb axle ends

Available in both single and dual caliper configurations, the 140-12557-D dual caliper setup maximizes clamping force and is the preferred choice for serious performance and drag racing applications where consistent, fade-resistant rear braking is critical.