AP Racing by Essex Radi-CAL Comp Brake Kit - Rear CP9451 (15-21 WRX, 15-21 STI)

“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.

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

Advantages Over OEM Brake System

• Our CP94X/340mm Radi-CAL Competition Brake Kit offers our customers the following advantages over the OEM brake system:

• AP Racing Radi-CAL calipers are the stiffest, lightest, and most technologically advanced calipers available at any price

• Calipers use a commonly available brake pad shape

• Ventilated, domed back, stainless steel pistons keep heat out of the brake fluid and provide an ultra-firm pedal

• Mitigation of pad knockback via anti-knockback springs behind the caliper pistons

• Anodized caliper finish that is resistant to wear and deterioration at elevated temperatures

• Stainless steel caliper hardware for a long caliper service life under frequent pad change conditions

• High temperature, low drag seals that will hold up to track temps= less rebuilding and longer service life

• No dust boots to burn up

• Simple pad change with one bolt, no caliper removal required

• Lifetime professional caliper rebuilding support by Essex (at a fee)- pull off your calipers, send them to us, we clean, inspect, and rebuild them

• Available disc burnishing service ensures that your kit arrives ready to be installed and driven hard immediately

• Championship winning, 60 vane, fully floating, AP Racing J Hook racing discs

• Anti-knockback/anti-rattle disc attachment hardware

• Replacement iron disc rings available at an extremely competitive replacement price ($329 each).

• Disc metallurgy specifically designed to handle the temps typically seen on track offer a long service life

• Highest quality, Spiegler stainless steel brake line with clear sheath that reduces compliance over OEM rubber design

FEATURES

• Retains OEM parking brake functionality

• Features AP Racing CP94X Radi-CAL four piston calipers

• 340x28mm, 60 vane AP Racing Discs with patented J Hook pattern

• 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 our front Essex/AP Racing Competition BBK

[ Excluded from Shipping Specials ]