Wilwood 2015-2023 Mustang Dynamic FSL4R/ST Forged Superlite 4R Big Brake Rear Kit (Race)

Upgrade your 2015-2023 Ford Mustang for dedicated road racing with the Wilwood Dynamic FSL4R/ST Forged Superlite 4R Big Brake Rear Kit. Engineered for competition use on base, EcoBoost and standard-production GT models, this rear race brake system is designed to provide matched front-to-rear brake balance, high durability and efficient heat management without adding unnecessary rotating or unsprung weight.

The system features Forged Superlite 4R/ST four-piston calipers with a durable Type III Mil-Spec medium-gray hard anodized finish. Thermlock pistons help reduce heat transfer from the brake pads into the caliper body, fluid and seals, while internal damper springs, controlled piston retraction and high-temperature seals help maintain consistent pedal feel during demanding track sessions. The caliper piston volumes are matched for compatibility with the factory master cylinder output and ABS controls.

Wilwood pairs the race calipers with 14.00-inch GT Competition Series 36-vane directional rotors. The rotors are dynamically mounted to lightweight forged aluminum hats to help control heat while minimizing rotating mass. High-temperature, high-friction race compound brake pads and premium-grade mounting hardware complete this dedicated competition package.

Product Features:

Wilwood Forged Superlite 4R Big Brake Rear Race Kit
Designed for 2015-2023 Ford Mustang
Dedicated Road Racing Brake System
Designed for Base, EcoBoost and Standard-Production GT Models
Forged Superlite 4R/ST Four-Piston Rear Calipers
Forged Aluminum Caliper Construction
Thermlock Pistons Help Reduce Heat Transfer
High-Temperature Piston Seals
Internal Damper Springs and Controlled Piston Retraction
14.00" GT Competition Series Rotors
36-Vane Directional Rotor Design
GT Slotted Rotor Faces
Dynamic-Mount Rotor Design
Lightweight Forged Aluminum Rotor Hats
High-Temperature, High-Friction Race Compound Brake Pads
Radial-Mount Caliper Design
Compatible with OE Master Cylinder Output and ABS Controls
Designed as the Rear Match for Wilwood AERO6R/ST Front Race Kits

Specifications:

Manufacturer	Wilwood Engineering
Part Number	140-14483
Product Type	Big Brake Rear Race Kit
Brake Location	Rear
Application Type	Dedicated Road Race
Caliper Type	Forged Superlite 4R/ST
Caliper Pistons	4
Caliper Finish	Type III Mil-Spec Hard Anodize
Mount Type	Radial
Rotor Diameter	14.00"
Rotor Width	0.81"
Rotor Series	GT Competition Series
Rotor Style	GT Slotted
Rotor Vane Design	36-Vane Directional
Rotor Mounting	Dynamic Mount
Rotor Hat	Forged Aluminum, Hard Anodized
Rear End / Axle	OEM
Axle Offset	0.00"
Line Kit	220-13913
Minimum Wheel Diameter	18"*
Vehicle Application	2015-2023 Ford Mustang

*This kit may fit some 18-inch wheels. Actual wheel clearance must be verified using Wilwood's wheel clearance diagram before installation.

Available Configuration:

140-14483 - Type III Hard Anodized Calipers - 14.00" GT Slotted Dynamic-Mount Rotors

Vehicle Fitment:

2015 Ford Mustang - Base
2015 Ford Mustang - EcoBoost
2015 Ford Mustang - GT
2016 Ford Mustang - Base
2016 Ford Mustang - EcoBoost
2016 Ford Mustang - GT
2017 Ford Mustang - Base
2017 Ford Mustang - EcoBoost
2017 Ford Mustang - GT
2018 Ford Mustang - Base
2018 Ford Mustang - EcoBoost
2018 Ford Mustang - GT
2019 Ford Mustang - EcoBoost
2019 Ford Mustang - GT
2020 Ford Mustang - EcoBoost
2020 Ford Mustang - GT
2021 Ford Mustang - EcoBoost
2021 Ford Mustang - GT
2022 Ford Mustang - EcoBoost
2022 Ford Mustang - GT
2023 Ford Mustang - EcoBoost
2023 Ford Mustang - GT

Fitment Notes:

Configured specifically for dedicated road racing applications.
Designed for base, EcoBoost and standard-production GT model 2015-2023 Mustangs.
Engineered as the rear brake match for Wilwood AERO6R/ST front race brake kits.
Uses Forged Superlite 4R/ST four-piston rear calipers with Type III hard anodized finish.
Uses 14.00" GT Competition Series 36-vane directional slotted rotors.
Rotors are dynamically mounted to lightweight forged aluminum hats.
Caliper piston volumes are matched for compatibility with the OE master cylinder output and ABS controls.
Also compatible with properly configured manual brake conversions using balance-bar pedals and appropriately sized master cylinders.
Road race kits use high-temperature racing brake pads. Extended low-temperature use can cause premature rotor and pad wear.
This is a dedicated race brake kit and should not be treated as a typical street-oriented rear brake upgrade.
Minimum wheel diameter is listed as 18"; actual wheel clearance must be verified before installation.
This rear race kit does not provide a parking brake cable system.