Wilwood 140-18368 SX6R Front Big Brake Kit Mustang II 15.00" Rotor Roadster Shop RSF-2

The Wilwood 140-18368 is a SX6R front big brake kit engineered specifically for Mustang II-style suspensions using the Roadster Shop RSF-2 Forged spindle. Designed as a fully bolt-on solution for Roadster Shop SPEC and REVO RS chassis, this kit delivers high-capacity braking performance with race-bred technology and contemporary styling.

At the heart of this kit is Wilwood's SX6R six-piston forged aluminum caliper—the largest dual-purpose caliper Wilwood has produced—paired with a massive 15.00-inch Spec37 iron rotor featuring 72 curved vanes for maximum thermal dissipation. The lightweight two-piece aluminum hat reduces unsprung rotational mass while maintaining the structural rigidity required for high-demand braking.

Key Features:

• SX6R Six-Piston Forged Aluminum Caliper — Wilwood's highest-capacity dual-purpose caliper, delivering maximum clamping force with reduced pedal effort
• 15.00" Spec37 Vented Iron Rotor — 72-curved-vane design for superior airflow and heat management
• Lightweight Two-Piece Aluminum Hat — Reduces unsprung weight without sacrificing strength
• BP-10 Street Performance Brake Pads — Quick initial response, fade resistance, and extended pad life for street and spirited driving
• Bolt-On Fitment — Designed specifically for the Roadster Shop RSF-2 forged spindle; compatible with SPEC and REVO RS chassis as well as custom builds using the RSF-2 spindle
• Multiple Finish Options — Calipers available in gloss red or black powder coat; additional colors available by custom order
• Optional Track Upgrades — Track-only caliper and pad upgrades available by custom order for extreme-duty applications

The SX6R's increased piston volume generates stronger clamping force with less pedal effort compared to smaller caliper configurations. Thicker vented rotors improve sustained cooling during repeated heavy braking events, making this kit well-suited for high-performance street driving, autocross, and road course use.