Wilwood 140-14980 Rear Disc Brake Kit BMW - FNSL4R/ST E46 M3

The Wilwood 140-14980 is a championship-proven rear disc brake kit engineered specifically for dedicated road racing on 2001-2006 BMW E46 M3 models. This complete system is designed to match AERO6R/ST front race kits, delivering improved front-to-rear brake balance, exceptional durability, and efficient heat management without adding unnecessary rotating or unsprung weight.

FNSL4R/ST Forged Aluminum Calipers:

• Forged aluminum construction with Type III Mil-Spec medium gray hard anodized finish for superior wear resistance and corrosion protection
• Thermlock® pistons reduce heat transfer from pads to caliper body, fluid, and seals for increased fade resistance and extended service life
• Internal damper springs and controlled retraction high-temperature piston seals ensure consistent pedal height throughout race sessions
• Piston volumes matched for full compatibility with OE master cylinder output and ABS controls
• Compatible with manual brake conversions using balance bar pedals and appropriately sized master cylinders

Spec37 Alloy GT Competition Rotors:

• 12.88-inch diameter directional vane rotors for optimal cooling and performance
• Dynamically mounted to OE hubs with weight-saving forged aluminum hats
• Hard anodized hats provide superior wear resistance at load-bearing surfaces
• Design accommodates elimination of parking brake hardware for further weight reduction

Complete Kit Includes:

• FNSL4R/ST forged aluminum calipers with hard anodized finish
• Spec37 alloy 12.88" directional vane rotors with forged aluminum hats
• Application-specific high-temperature, high-friction endurance compound race pads
• Stainless steel braided flexlines
• Mounting brackets and premium grade fasteners

Installation mounts calipers to stock upright locations with minor dust shield modifications. This system represents the ideal rear brake upgrade for serious E46 M3 road racing applications where performance, weight savings, and reliability are paramount.