Wilwood 120-13288 Radial Mount Disc Brake Caliper Anodized Left - Aero4 4-Piston

The Wilwood Aero4 (120-13288) is a forged four-piston radial mount brake caliper engineered to deliver serious stopping power for both street and track applications. As the latest evolution of Wilwood's W4A/W6A caliper series, the Aero4 brings significant design advancements while maintaining the broad versatility the series is known for.

One of the most notable upgrades in the Aero4 design is the integration of internal fluid ports, which eliminate the external fluid cross-over tubes and bulky center bridge assembly found on previous generations. The result is a cleaner, more structurally efficient caliper with improved fluid dynamics and a lower-profile footprint.

The caliper body is stress-flow forged from a premium-grade aluminum alloy. This process realigns the metal's internal grain structure to follow the contour of the caliper body, eliminating the stress concentrations and grain interruptions that occur when machining from straight billet stock. The outcome is exceptional clamping efficiency and superior resistance to fatigue, distortion, and stress under heavy braking loads.

Key Features:

• Forged four-piston design with race-proven technology
• Radial mount configuration for precise, rigid caliper positioning
• Internal fluid ports eliminate external cross-over tubes and center bridge
• Compatible with rotor diameters from 12.88" to 15.00"
• Multiple piston volume options for tunable braking performance
• Stress-flow forged premium aluminum alloy construction
• Hard anodized finish for corrosion resistance and durability
• Left-hand fitment
• Uses brake pad plate #6617

The Wilwood Aero4 is purpose-built for high-demand braking environments, offering the strength and adaptability required for performance street builds, road racing, and heavy-duty motorsport applications.