Wilwood Narrow Superlite 4-Piston Rear Big Brake Kit

2007–2018 Jeep Wrangler JK

Part #: 140-13969-D

Overview

The Wilwood Narrow Superlite 4-Piston Rear Big Brake Kit is a high-performance upgrade designed specifically for the 2007–2018 Jeep Wrangler JK. This kit enhances rear braking capability by combining forged Narrow Superlite 4R four-piston calipers with drilled 12.88-inch rotors, delivering superior stopping power and improved heat dissipation. Ideal for Jeep enthusiasts seeking enhanced braking performance for street, off-road, or show applications, this kit maintains full compatibility with the original equipment parking brake, master cylinder output, and ABS systems.

Engineered to complement front brake upgrades ranging from 13 inches and larger, this rear kit ensures balanced braking performance while supporting upgraded wheels, tires, and suspension components. The black powder-coated calipers offer a sleek, durable finish that adds both style and corrosion resistance.

Key Features

This rear big brake kit combines advanced engineering and quality materials to deliver reliable, high-performance braking. Key features include:

• Forged Narrow Superlite 4R four-piston calipers for increased clamping force and consistent brake pad contact
• Drilled 12.88-inch rotors designed for enhanced heat dissipation and reduced brake fade
• Black powder-coated calipers for corrosion resistance and a refined appearance
• BP-10 compound brake pads optimized for street and light performance use
• Maintains full use of the original equipment parking brake system
• Compatible with factory master cylinder output and ABS systems
• Designed for radial mount installation on OEM rear axle with zero offset
• Requires a minimum 17-inch wheel diameter for proper clearance
• Engineered to complement front big brake upgrades for balanced braking performance

Construction & Design

The calipers are forged from high-strength aluminum alloy, providing an excellent strength-to-weight ratio that reduces unsprung mass while maintaining durability under demanding conditions. The Narrow Superlite design optimizes caliper size for improved wheel clearance without sacrificing braking power. The rotors are precision-machined from premium-grade iron and feature a drilled pattern to improve cooling and reduce the risk of brake fade during extended use.

Each component is finished with a black powder coat that resists corrosion and wear, ensuring long-lasting performance and a clean, aggressive look that complements the rugged style of the Jeep Wrangler JK.

Installation & Fitment

This kit is engineered for direct bolt-on installation to the 2007–2018 Jeep Wrangler JK rear axle with no modifications required to the parking brake or ABS systems. The radial mount caliper design aligns precisely with the OEM mounting points, simplifying installation and ensuring reliable operation. A minimum 17-inch wheel diameter is required to accommodate the larger rotor and caliper assembly.

Installation should be performed by a qualified technician to ensure proper brake system function and safety. Brake fluid bleeding and system checks are recommended after installation to maintain optimal performance.

What's Included

• Forged Narrow Superlite 4R four-piston black powder-coated calipers (pair)
• Drilled 12.88-inch rotors (pair)
• BP-10 compound brake pads pre-installed
• Mounting hardware and brackets for OEM axle compatibility
• Installation instructions

Ideal For

This rear big brake kit is ideal for Jeep Wrangler JK owners who demand improved rear braking performance for enhanced safety and control. It suits enthusiasts upgrading their braking system for spirited street driving, off-road adventures, or show vehicles requiring both style and function. The kit pairs perfectly with front big brake upgrades and suspension enhancements to create a balanced, high-performance braking system tailored to the Jeep Wrangler JK platform.

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.