Wilwood 120-13338 Aero4 Forged Four Piston Radial Mount Disc Brake Caliper

The Wilwood Aero4 forged four piston caliper (P/N 120-13338) delivers heavy-duty stopping power for both street and track applications. Engineered with race-proven technology, this caliper features a versatile design with radial mounting, multiple piston volume configurations, and compatibility with rotor diameters ranging from 12.88" to 15.00", making it ideal for high-performance braking systems on heavy vehicles.

Key Features:

• Stress-flow forged construction from premium grade aluminum alloy billet for superior strength
• Four piston design provides balanced clamping force and consistent pad wear
• Radial mounting configuration for easy installation and optimal caliper positioning
• Compatible with rotor diameters from 12.88" to 15.00"
• Multiple piston volume options to match specific braking requirements
• Forging process realigns internal grain structure for enhanced fatigue resistance
• Eliminates internal stresses and distortion under heavy braking loads

The stress-flow forging process used in Aero4 caliper construction realigns the aluminum's internal grain structure to flow within the contour of the caliper body, rather than cutting across it as occurs with traditional billet machining. This results in superior clamping efficiency, ultimate strength against fatigue, and resistance to distortion under extreme braking conditions.