Wilwood 140-11451 GNX4 Street Performance Disc Brake Kit

The Wilwood 140-11451 GNX4 Street Performance Disc Brake Kit is engineered using Wilwood's in-house Finite Element Analysis (FEA) design and 3-D modeling technology, delivering a precision-engineered braking upgrade built to exacting performance standards.

At the heart of this kit is the GNX4 caliper paired with 12.00" diameter, 0.95" wide rotors, providing a durable, high-torque braking solution. The GNX4 caliper's superior piston design generates positive pedal response and high clamping efficiency, while offering a substantial weight reduction compared to original OE calipers.

Key Features:

• Forged billet aluminum caliper bodies — lightweight and exceptionally rigid for consistent braking performance
• Stainless steel pistons — resist corrosion, delay heat transfer from brake pads, and eliminate bore pitting failures common in OE designs
• High-temperature seals — engineered to withstand extreme braking conditions and prevent seal failures
• Natural aluminum finish with a durable clear coat anodizing for long-lasting protection
• 12.00" rotor diameter with 0.95" rotor width for optimal thermal mass and braking torque
• Aluminum calipers dissipate heat faster than OE cast iron calipers, resulting in cooler operating temperatures and extended service life
• Noted as the current upgrade solution for AM General Military REV HUMVEE vehicles (modifications to vehicle platform required for installation)

Important Note: Rear brake kits do not include a provision for a parking brake.

The Wilwood 140-11451 is the ideal choice for performance street driving applications where improved stopping power, reduced unsprung weight, and long-term reliability are priorities. Cooler operating temperatures translate directly into longer pad, rotor, and caliper service life regardless of driving environment.