Essex Designed AP Racing Radi-CAL Enduro Brake Kit - Front CP9660 (04+ STI)

Complete front Essex Designed AP Racing Radi-CAL Competition Brake Kit for the Subaru WRX STI.

  • Features AP Racing CP9668 Radi-CAL six piston calipers, uses 25mm thick pad
  • 355x32mm, 72 vane AP Racing disc
  • Saves roughly 9 unsprung lbs. from nose vs. OEM brakes
  • 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
  • Designed to work with OEM rear brakes
SKU
13.01.10068
$4,599.00

 

Staying in front can be every bit as demanding as taking the lead.
At AP Racing, yesterday's knowledge, know how and experience provide the platform for today's development. Building on success, AP Racing is constantly exploring new systems, techniques and materials in a continuous quest for further improvement.

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.

DISCS- AP RACING COMPETITION J HOOK
The AP Racing J Hook discs in our system are the epitome of endurance racing components. They will hold up extremely well to any abuse you plan to throw at them. These discs have been proven time and again in professional racing, winning many races and even championships (ALMS, Rolex, Grand Am, etc.).

Two-piece Floating Design with Aluminum Hat

As is the case with most metal, iron brake discs grow substantially when heated. As it is heated, a disc expands radially, increasing in diameter and circumference. One-piece disc designs run into problems when this occurs. Look at the picture below and imagine the disc is being heated on the track. As the disc expands, the outer edges of the disc are pulling away from the center of the disc, but there are no built-in provisions to allow for that expansion. The edges of the disc therefore pull, lift, and distort, which is called coning. Now imagine that disc vertical on the car, running in your caliper. Coning directly impacts the brake pads' contact with the disc, leading to uneven wear and tapering, and even a long brake pedal.

Two-piece discs on the other hand, compensate for the expansion of the disc as it heats. This is accomplished by building Ëfloat' into either the disc itself, or the disc hat/bell. In this case, the float is in the disc. If you look closely at the picture below, you can see that the mounting holes for the hat attachment bobbins are not round. They are an oblong shape. These channels allow the hat mounting hardware to slide as the disc is heated and expands, allowing the disc to run true in the caliper without distortion. That means less distortion, stress cracks, and pad taper.

Included in the Kit:

  • One pair AP Racing CP9668 Radi-CAL Pro5000R racing calipers
  • One pair 355x32mm AP Racing CP5773, 72 vane, J Hook racing 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
  • Detailed installation instructions
  • Does NOT include brake pads or tension clips

Vehicle Fitment:

  • 2004+ STI

warning_symbolWARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.

More Information
SKU 13.01.10068
Product Type Brakes
Brakes Big Brake Kits
Brand AP Racing
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