AP Racing's part number:

• Disc: CP4284-156GA/CP4284-157GA
• Caliper: CP9669-2S4L/CP9669-3S4L, 6 pot, ENP

Complete front AP Racing by Essex Radi-CAL Competition Brake Kit for the Porsche 991 GT3/3RS/2RS and Cayman 718 GT4 RS:

• Features AP Racing Radi-CAL 9669 calipers with 25mm (1 inch) thick pads for extreme durability!
• Jewel-like ENP Caliper finish is incredibly durable and easy to clean
• Clears many popular 19" and 20" track wheels - see Wheel Fitment & Installation tab for details
• Durable, ventilated stainless steel pistons (no ceramic piston caps to break) with anti-knockback springs
• Design eliminates the need to remove caliper for pad changes
• Saves 10 unsprung lbs. vs. OEM iron brakes and very close in weight to the OEM PCCB system
• 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 J Hook Discs
• 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
• Patented Disc Burnishing/Bedding Service with kit purchase $100

What's In The Box?

• One pair AP Racing CP9669 Radi-CAL Pro5000R racing calipers in ENP (Electroless Nickel Plated) finish
• 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.

Calipers

ENP (Electroless Nickel Plated) Finish

The first obvious weakness when looking at a typical aftermarket caliper is the finish. Most aftermarket calipers come in a painted finish, whether they are red, black, or gold. That painted finish is designed to look pretty and prevent corrosion in harsh winter environment. Unfortunately, for all of the compliments painted calipers generate, there is an associated price if you drive the car in a track environment. That price is the chipping, flaking, fading, color shift, and general degradation of that finish in a fairly short period of time. Some OEM calipers can go from the as-delivered color to a nasty shade of brown in as little as one weekend. While this is typically worn as a badge of honor among our more hardcore customers, let’s face it…they still look terrible. More importantly however, all of those bits of paint end up in places they’re not supposed to, which we’ll get to in a minute.

Why does this happen? Heat. Paint and powder coat cannot adequately handle track temperatures. Powder coat also has some notorious issues with shrinkage. The powder coat layer expands and grows when the caliper is heated. When it cools, the powder coat doesn’t necessarily shrink in step with the caliper body itself. What’s left is a loose shell of finish hanging limply on the caliper body. That shell then cracks and falls to pieces.

Paint can also have similar issues depending on how it is applied. If you were to line up a few aftermarket calipers from the same manufacturer, you would likely see that the painted finish on each of those calipers is slightly different. Some have a thicker coat, some thinner, slightly different shades of red, etc. Painting is to some extent an art form, and must be performed in a tightly controlled environment. If it isn’t, you’re always going to see variation. A thick coat makes the part look soft around the edges, and is prone to cracking off in the same manner as the powder coat described above, leaving the underlying finish exposed. A part without enough paint will look uneven, and will not protect the underlying aluminum particularly well either. In addition to problems with cracking, flaking, and uneven application, paint and powder coat also experience extreme color shift when heated. Red becomes maroon or black, gold becomes brown, and black just gets uglier.

The calipers we use in our AP Racing by Essex Radi-CAL Competition Kits don't have any of the above issues. In this kit, the calipers feature an Electroless Nickel Plated (ENP) finish. Because ENP is extremely hard and resistant to wear and corrosion, it is used in applications as diverse as the manufacture of hard disc drives and the targeting pods of the F-15 Eagle fighter jet. ENP is perfect for calipers that are frequently bled, and it won't chip and flake like a painted caliper if you bump it with your box wrench. It is the ideal finish for highly complex parts like the AP Radi-CAL, because it can be applied to the caliper's many curves and pockets in a very thin, uniform manner. ENP also has extremely low porosity, which is perfect for components exposed to harsh chemicals such a brake fluid. If you do get fluid, dirt, or debris on your calipers, ENP is incredibly easy to clean, and a quick wipe will bring it back to its former luster. Last but not least, ENP provides a jewel-like, liquid metal appearance to your brake system. The neutral, yet eye-catching finish meshes perfectly with just about any color scheme as it catches and reflects light.

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.