AP Racing Radi-CAL II Brake Kit by Essex

The AP Racing Radi-CAL II Brake Kit by Essex is a high-performance braking upgrade designed for drivers who demand improved pedal feel, braking consistency and thermal performance for both spirited road driving and track use.

At the core of the system is AP Racing's World Radi-CAL II caliper technology, featuring the company's asymmetric Radi-CAL design philosophy. The architecture is engineered to increase caliper stiffness, reduce unnecessary mass and improve airflow around the braking hardware. Essex notes that Radi-CAL technology provides significant stiffness gains while also reducing caliper mass and improving cooling efficiency.

The Radi-CAL II range includes road-focused calipers such as the CP9561 and CP9562 six-piston front calipers and the CP9541 four-piston rear caliper, depending on the vehicle-specific configuration. These calipers are paired with application-specific high-performance brake discs, lightweight mounting hardware and stainless-steel brake lines.

The system is engineered as a complete package, with piston sizing selected to maintain appropriate brake bias and compatibility with the vehicle's OEM master cylinder and ABS system. Depending on the application, the kit can also feature high-vane-count directional discs with floating or fixed aluminium hats.

The asymmetric caliper design also helps optimize packaging around the wheel, allowing the braking hardware to deliver high thermal performance without unnecessary bulk. This combination of stiffness, cooling and lightweight construction contributes to a more precise pedal feel and improved brake modulation under heavy braking.

The AP Racing Radi-CAL II Brake Kit by Essex is an ideal upgrade for performance vehicles looking for a serious improvement in Brake Feel, Thermal Management, Consistency and Track Performance, while retaining suitability for road-oriented applications.