Brake Pad XRZ4R BP-40 10420 Pad Shape

The Wilwood Brake Pad XRZ4R BP-40 (MPN 150-16500K) is a high-temperature racing brake pad engineered for extreme friction demands and thermal stability. Designed specifically for Wilwood XRZ4R calipers, these brake pads deliver very high friction coefficients across a wide operating temperature range, making them suitable for sustained hard braking applications where conventional pads would fade or glaze.

The BP-40 compound is a semi-metallic formulation that maintains consistent friction levels even under continuous high-heat conditions. Unlike street-oriented pads, the XRZ4R brake pad set tolerates fade and exhibits predictable modulation at elevated temperatures—critical for drivers who regularly subject their braking system to track-level stress. The compound's composition supports extended pad life under racing duty while resisting the thermal deterioration that compromises braking performance during multiple hard stops or prolonged descents.

These pads are engineered for motorsports applications, driver training events, and high-performance road use where brake temperatures regularly exceed 300°F. The XRZ4R pad set is particularly effective in closed-course environments, off-road racing scenarios, and recovery or pursuit driving where repeated aggressive braking is inevitable. Operators and enthusiasts running Wilwood 4-piston calipers on dedicated performance vehicles rely on this pad set to maintain braking authority when standard compounds would deteriorate rapidly.

Wilwood racing brake pads are established in the motorsports aftermarket as dependable solutions for vehicles engineered to withstand extreme duty cycles. The XRZ4R pad line integrates seamlessly with Wilwood's caliper ecosystem and is sized to fit the brake pad shape specification noted in the product designation, ensuring proper fit and consistent contact with rotor surfaces during installation and operation.