Radi-CAL Competition Brake Kits
“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. Calipers leveraging the Radi-CAL design philosophy 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. Please click here for the AP Racing Radi-CAL story.
While our standard Essex Designed AP Racing Competition Brake Kits remain an excellent choice for chasing lap times, our Radi-CAL Competition Brake Kits bring the bleeding edge of racing brake technology to the common enthusiast. These systems include all of the standard features of our Competition BBK's, but leverage AP Racing's Pro5000R Radi-CAL's to increase stiffness, lower mass, and optimize cooling and wheel fitment.
The key benefits of the Radi-CAL design are:
- Massive Stiffness Increase- A 30+ % increase in both static and dynamic stiffness 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.
- Efficient Packaging- The wide, asymmetric caliper profile and internal porting allows the caliper to fit into tighter spaces.
For a comparison between the various types of big brake kits that we offer, please visit our big brake kit overview page.
AP Racing by Essex Radi-CAL CP9668 caliper upgrade for AP/Essex 2-pc discs - Audi TTRS/RS 3 (8V/S)
Part #: 13.01.10106
AP Racing by Essex Radi-CAL Competition Brake Kit (Front 9660/372mm) - Audi S4 (B8 and B8.5) 09-16
Part #: 13.01.10135
AP Racing by Essex Radi-CAL Competition Brake Kit (Front 9668/372mm) - Audi S4 (B8 and B8.5) 09-16
Part #: 13.01.10136
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