Wilwood 140-18160 Forged Narrow Superlite 4R Rear Disc/Drum Big Brake Kit 12.88 Rotor 6-Lug

The Wilwood 140-18160 Forged Narrow Superlite 4R (FNSL4R) Rear Disc/Drum Big Brake Kit delivers a complete, high-performance rear braking solution for 1971–1991 Blazer and compatible 6-lug rear axle applications. Engineered as the ultimate big brake upgrade for muscle car and performance street builds that require an integrated parking brake, this kit is designed to complement front big brake systems with balanced, optimized stopping power.

At the heart of this kit is Wilwood's FNSL4R four-piston caliper, a forged aluminum unit with a narrow profile that maximizes wheel clearance while delivering consistent clamping force across a 12.88" two-piece rotor. The rotors are engineered to handle the thermal demands of aggressive street and high-performance driving while keeping unsprung weight in check.

Key Features:

• FNSL4R Four-Piston Caliper — Forged narrow-body aluminum construction for strength and lightweight performance
• 12.88" Two-Piece Rotor — Large-diameter rotor for increased braking torque and heat dissipation
• BP-10 High-Performance Brake Pads — Optimized compound for street and performance driving with low dust and strong initial bite
• Integrated Internal Shoe Parking Brake — Concealed drum-in-hat design provides a clean, factory-style appearance with strong static holding power
• 6-Lug Hub Pattern — Designed specifically for 6-lug rear axle configurations
• Big Brake Ready — Engineered to balance with Wilwood front big brake kit upgrades
• Custom-Friendly Design — Compatible with optional caliper finishes and rotor styles to match build aesthetics

The internally hidden parking brake shoe system keeps the installation clean and uncluttered, making this kit ideal for show cars, restomod builds, and high-performance street machines alike. The complete bolt-on kit includes all necessary brackets, hardware, calipers, rotors, and pads for a straightforward installation.