Wilwood Narrow Superlite 4-Piston Rear Big Brake Kit

2007–2018 Jeep Wrangler JK

Part #: 140-13969-R

Overview

The Wilwood Narrow Superlite 4-Piston Rear Big Brake Kit is engineered specifically for the 2007–2018 Jeep Wrangler JK, delivering enhanced stopping power and improved brake feel for both street and off-road driving. Designed to complement front big brake upgrades, this kit upgrades your rear braking system with forged four-piston calipers and slotted rotors, providing consistent performance under demanding conditions. Ideal for Jeep enthusiasts seeking a reliable, high-performance brake solution that retains full compatibility with the original equipment parking brake, master cylinder, and ABS systems.

This rear brake kit balances aggressive braking capability with a clean, custom look thanks to its red powder-coated calipers and slotted 12.88-inch rotors. It is perfect for drivers upgrading wheels, tires, and suspension who require a brake system that matches their vehicle’s enhanced capabilities.

Key Features

Wilwood’s Narrow Superlite 4-Piston Rear Big Brake Kit combines advanced engineering and quality materials to deliver superior braking performance. Key features include:

• Forged Narrow Superlite 4R calipers with four pistons for increased clamping force and even pad wear
• Red powder-coated finish for corrosion resistance and a striking appearance
• Slotted 12.88-inch rotors designed to improve heat dissipation and reduce brake fade
• BP-10 compound brake pads optimized for street performance and durability
• Maintains full use of the original equipment parking brake system
• Compatible with factory master cylinder output and ABS systems
• Designed for OEM axle offset with radial mount caliper configuration
• Requires a minimum 17-inch wheel diameter for proper fitment
• Complements front big brake kits with 13-inch or larger rotors for balanced braking performance

Construction & Design

The calipers are precision forged from high-strength aluminum alloy, providing an excellent strength-to-weight ratio that reduces unsprung mass for improved suspension response. The Narrow Superlite design optimizes clearance for larger wheels and suspension components while maintaining robust braking capability. The rotors are crafted from premium-grade cast iron with precision-machined slots to enhance pad bite and channel away gases and debris, ensuring consistent braking performance under heavy use.

Each component undergoes rigorous quality control to meet Wilwood’s exacting standards, ensuring long-lasting durability and reliable performance in demanding driving environments.

Installation & Fitment

This rear big brake kit is designed as a direct bolt-on upgrade for the 2007–2018 Jeep Wrangler JK, requiring no modifications to the factory parking brake or ABS systems. Installation is straightforward for experienced technicians and enthusiasts familiar with brake system upgrades. The kit fits OEM axle offset and requires a minimum 17-inch wheel diameter to accommodate the larger calipers and rotors.

Wilwood provides detailed installation instructions to facilitate a smooth upgrade process, ensuring proper brake system function and safety.

What's Included

• Forged Narrow Superlite 4R four-piston rear calipers with red powder coat finish
• Slotted 12.88-inch rotors
• BP-10 compound brake pads pre-installed in calipers
• Mounting hardware and brackets for OEM axle offset
• Installation instructions

Ideal For

This Wilwood rear big brake kit is ideal for Jeep Wrangler JK owners who have upgraded their front brakes, wheels, tires, or suspension and want a balanced, high-performance braking system. It suits off-road enthusiasts, street performance drivers, and show vehicle builders seeking improved stopping power, enhanced brake feel, and a custom appearance without sacrificing factory parking brake functionality or ABS compatibility.

Wilwood Engineering is a major manufacturer of high-performance disc brake solutions spanning racing, street performance, and specialty OE applications. From big brake kits and calipers to rotors and hydraulic components, Wilwood upgrades are built for stronger stopping power, better heat management, and consistent pedal feel when stock brakes aren’t enough.