AP Racing by Essex Road Brake Kit (Rear 9541/380mm)- F87 BMW M2, F80 M3, F82 M4

What's In The Box?
One pair AP Racing CP9541 World Radi-CAL II four piston calipers
One pair 380x28mm AP Racing CP5914, 72 vane, J Hook discs, with fully floating 6061 hard anodized aluminum hats, and attachment hardware
One pair caliper mounting brackets and hardware
One pair Spiegler Stainless Steel Brake Lines with abrasion resistant coating
One set of Ferodo DS2500 Brake Pads
Detailed installation instructions
Calipers
Radi-CAL
“Radi-CAL” is a blanket term used to describe AP Racing’s patented asymmetrical brake caliper design. Radi-Cal technology is grounded in Computer Aided Design (CAD) and Finite Element Analysis (FEA), and allows for organic, alien-looking designs that are a radical departure from conventional caliper designs of the past. Radi-CAL's are widely considered the pinnacle of current brake caliper technology. Since their inception in 2007, these revolutionary calipers have amassed a lengthy string of race victories at all levels of professional motorsport, while redefining brake performance expectations. For more details on the design concept and what these calipers have achieved in professional racing, please visit our blog and read The AP Racing Radi-CAL Story.

The key benefits of the Radi-CAL design:

Massive Stiffness Increase- A 30+ % increase in both static and dynamic stiffness vs. conventional calipers allows for far less deflection under load, which means superior pedal feel & modulation, more even pad wear, and longer caliper service life.
Considerable Mass Reduction- Removing all extraneous caliper mass lowers the caliper weight, despite the huge stiffness increases.
Optimized Airflow- Air moves around and through the caliper more efficiently, providing superior heat evacuation and cooling.
Efficient Packaging- The asymmetric caliper profile allows the caliper to fit into tighter spaces.