Wilwood GP320 Rear Brake Kit 140-11774 with 4-Piston Caliper and Drilled Steel Rotor

Upgrade rear braking performance with the Wilwood GP320 Right/Left Rear Brake Kit, part number 140-11774. Designed for sprint car applications, this complete brake system combines a lightweight aluminum four-piston caliper with a drilled and scalloped steel rotor for dependable stopping power and efficient heat management. The gray anodized finish adds corrosion resistance and a professional appearance suitable for demanding motorsports environments.
The GP320 kit includes a rear-mounted caliper and a steel rotor engineered for consistent braking performance during repeated high-load use. Its sprint car hat features a 3 x 46 spline configuration, providing application-specific fitment for compatible rear-end assemblies. The right- and left-side design supports flexible installation while helping simplify component selection for race car builders and performance-focused enthusiasts.
Wilwood is recognized for purpose-built braking systems designed to deliver reliable pedal response, predictable control, and durable operation. This GP320 rear brake kit is a practical choice for competition vehicles requiring a compact, high-performance rear braking solution. Verify wheel, axle, mounting, and spline compatibility before installation, and follow all manufacturer recommendations for setup, bedding, inspection, and maintenance.

Features:

• Brand: Wilwood

• Part Number: 140-11774

• Brake System: GP320 rear brake kit

• Caliper: Four-piston aluminum caliper

• Rotor: Drilled and scalloped steel rotor

• Rotor Size: 10.5 inches

• Sprint Car Hat: 3 x 46 spline configuration

• Finish: Gray anodized aluminum

• Application: Right- or left-side rear installation

• Use: Sprint car and motorsports applications