Wilwood 140-18151-DR Forged Narrow Superlite 4R Rear Disc/Drum Big Brake Kit - Big Ford New Style, 2.50" Offset, 12.88" Rotor, 6-Lug, Red Caliper

The Wilwood 140-18151-DR is a complete Forged Narrow Superlite 4R (FNSL4R) rear disc/drum big brake conversion kit designed for Big Ford New Style rear axle housings with a 2.50" axle flange offset and a 6-lug bolt pattern. This kit delivers a true big brake upgrade for muscle cars, custom builds, pro-touring machines, and high-performance street vehicles that retain a functional parking brake.

At the heart of the kit is the FNSL4R four-piston forged narrow caliper in a bold red finish, paired with a 12.88" two-piece SRP (Standard Racing Profile) drilled and slotted vented rotor measuring 1.10" wide. The BP-10 high-performance brake pad compound delivers optimized, balanced stopping power that complements Wilwood front big brake upgrades across all types of builds.

Key Features:

• Caliper: FNSL4R 4-piston forged narrow caliper — Red anodized finish
• Rotor: 12.88" (13" OD) two-piece SRP drilled and slotted vented rotor, 1.10" wide
• Parking Brake: Integrated internal drum-style shoe system — hidden for a clean, factory-style appearance with strong static holding force
• Axle Compatibility: Big Ford New Style rear axle housing with 2.50" axle flange offset
• Bolt Pattern: 6-lug configuration
• Brake Pads: BP-10 high-performance compound included
• Minimum Wheel Size: 17" diameter required
• Complete kit includes calipers, rotors, brackets, pads, and all necessary mounting hardware

The concealed internal shoe parking brake mechanism keeps the installation looking clean while providing reliable holding power. The drilled and slotted SRP rotor design improves heat dissipation and wet-weather bite, making this kit equally at home on show cars and spirited street machines. This kit is engineered to bolt directly to Big Ford New Style rear ends, making it a straightforward upgrade for Ford-based muscle car and truck builds.