Wilwood 140-17142 Big Brake Rear Axle Disc Brake Kit with Rotors - AERO4-MC4 14

The Wilwood 140-17142 is an AERO4-MC4 Big Brake Rear Axle Kit engineered to replace factory rear disc brakes on late-model high-performance vehicles. Designed as a companion upgrade to front big brake systems, this kit integrates seamlessly with OE components while delivering a substantial increase in braking capacity and visual impact.

At the heart of this kit are AERO4R four-piston calipers — competition-proven units with fully machined forged caliper bodies that deliver superior strength and resistance to deflection under high braking loads. The calipers are paired with BP-10 compound brake pads, a high-temperature formulation suited for street performance and spirited driving. Stopping power is anchored by oversized 14.00" rotors, all carefully matched to work within OE master cylinder output, ABS system function, and individual vehicle brake bias requirements.

The included MC4 parking brake assembly provides a clean, fully integrated solution for the rear axle, replacing the factory unit without compromising parking brake functionality.

Key Features:

• AERO4R four-piston forged aluminum calipers for high-load braking performance
• Oversized 14.00" rear rotors for maximum heat dissipation and stopping force
• BP-10 high-temperature compound brake pads included
• MC4 parking brake assembly for complete OE parking brake integration
• Fully compatible with OE master cylinder output and ABS systems
• Engineered to match individual vehicle front-to-rear brake bias requirements
• Bolt-on installation — replaces factory rear disc brake assembly
• Complements big wheel, tire, and suspension upgrades on customized vehicles
• Manufactured in the USA by Wilwood Engineering

The Wilwood 140-17142 is the ideal rear brake upgrade for high-performance vehicles that have been modified with larger wheels, lowered suspensions, or front big brake kits, and for any build where increased rear braking demand requires a purpose-built solution.