Essex Designed AP Racing Radi-CAL Competition Brake Kit (Rear CP9451/340mm) | Part #: 13.01.10110

KD 1,482.000

Essex Designed AP Racing Radi-CAL Competition Brake Kit (Rear CP9451/340mm) | Part #: 13.01.10110

SKU: 13.01.10110 Categories: , , ,

KD 1,482.000

Big Brake Kit/Track (RR)

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Essex Designed AP Racing Radi-CAL Competition Brake Kit (Rear CP9451/340mm)- e46 M3

Part #: 13.01.10110

Complete rear Essex Designed AP Racing Radi-CAL Competition Brake Kit for the e46 M3.

  • Retains OEM parking brake functionality
  • Features AP Racing CP9451 Radi-CAL four piston calipers
  • 340x28mm, 60 vane AP Racing disc
  • Saves 14 unsprung lbs. from tail 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 both of our front Essex/AP Racing Competition BBKs

Application: Track


  • One pair AP Racing CP9451 Radi-CAL Pro5000R racing calipers
  • One pair 340x28mm AP Racing CP8972, 60 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
  • Including brake pads Ferodo DS3.1 and Pad tension kit

Advantages Over OEM Brake System

Our CP9451/340mm Radi-CAL Competition Brake Kit offers our customers the following advantages over the OEM brake system:

  • Approximately 14 lbs. of unsprung weight reduction from the car
  • 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
Model Year 2002-2006
e46 M3 OEM base
Caliper AP Racing CP9451-2/3S4L
Weight no Pads 4.85 lbs. 7.5 lbs.
Piston Sizes – Ø28.58 x 2
– Ø34.0 x 2
Piston Area 30.9 cm^2
Inlet Thread M10x1.0
Mounting Type Radial
Mtg. Centers 152mm
Mtg. Offset 44mm
Pad thickness 16.75mm 17.2mm
Disc CP3864-100/101GA
Type 2-piece floating Dual-cast
Weight 10.75 lbs. 17 lbs.
Diameter 340mm 327mm
Thickness 28mm 20mm
Radial Depth 42mm 59.4mm
No. of Vanes 60



Essex Parts

While working in the racing industry in his native England, Essex founder Michael Gue discovered pent up demand for British road racing cars and parts in the USA. After moving to Essex Connecticut and adopting the town's name for his business in 1981, Essex Racing was established, and quickly developed a sizeable and loyal clientele. In 1983, the business moved to the warmer climate of Atlanta Georgia, and continued to thrive as the U.S. importer for Van Diemen and Tiga formula and sports racing cars. Essex was very active in SCCA and IMSA road racing, and the Essex racing team was a winning competitor at both professional and amateur events across North America. As the demand for Essex's racing cars grew, so did the requests for accompanying spare parts. A separate business was formed to handle this need in 1992, and Essex Parts Services was born. During the following decade, Essex Parts Services became one of the premier suppliers of both road racing and stock car parts in the USA. Michael left the company to pursue other interests in 1999, and Essex Parts Services was purchased by Richard Martin and Ken Gordon. Essex continued to prosper, and was moved to Charlotte NC in 2004 to better serve a growing stock car customer base. Essex has listened closely to the needs of its customers, and has continually evolved to meet those demands. While the product line today bears little resemblance to the one 35 years ago, the company's core business values remain intact. Essex therefore remains well positioned as a major player in the supply of high quality parts and services to road racing, stock car, and high performance street customers in North America.