AP Racing's part number:

• Disc: CP4284-156GA/CP4284-157GA
• Caliper: CP9661-2S4L/CP9661-3S4L, 6 pot, ANO

Complete front AP Racing by Essex Radi-CAL Competition Brake Kit for all 997.2 GT3, and 997.1 GT3 originally equipped with PCCB:

• Saves 11 unsprung lbs. vs. the front OEM 380mm iron brakes, despite our larger discs
• AP Racing Radi-CAL with durable, ventilated stainless steel pistons (with no ceramic caps to destroy) with anti-knockback springs
• Allows for the preservation of pricey OEM brake components
• Huge array of brake pad options from all major pad manufacturers
• 394x34mm, 84 vane AP Racing disc fits inside many popular 19" wheels
• Every component designed to resist the heat of extended track sessions
• Pistons sized properly to allow for seamless integration with OEM master cylinder and ABS system
• Includes pad tension kit (eliminates noise) and disc burnishing at no additional cost
• Designed to work with OEM rear brakes or our Essex/AP Racing rear BBK
• Requires 19" wheels
• Patented Disc Burnishing/Bedding Service with kit purchase $100

What's In The Box?

• One pair AP Racing CP9661 Radi-CAL Pro5000R racing calipers
• One pair 394x34mm AP Racing 84 vane, J Hook racing discs, with fully floating 6061 hard anodized aluminum hats and attachment hardware. Disc burnishing in Ferodo Racing pad compound included at no additional charge (normally $150 per disc pair). If you are using a brake pad brand other than Ferodo and are interested in compatible disc burnishing, please contact Essex support prior to purchase.
• One pair caliper mounting brackets and hardware
• One pair Spiegler Stainless Steel Brake Lines with abrasion resistant coating
• Caliper Bridge Pad Tension Clips (frequently referred to as anti-rattle clips)
• Detailed installation instructions
• Brake pads are NOT included with our system. Racing brake pads are a highly personal choice. Many manufacturers include a set of inexpensive, low quality pads with their brake kits. Rather than artificially inflating the price of our system with a set of pads you probably don't want anyway, we've decided to remove the cost from our system and allow our customers to choose the pads that best suit their needs/wants. When purchasing our kit, you are able to choose one set of front pads at a substantial discount vs. the retail price. Please use the drop-down menu to select your pads.

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 and internal fluid porting allows the caliper to fit into tighter spaces.