AP Racing Radi-Cal By STILLEN 6 Piston Big Brake Kit For The 2005-2014 Mustang

 AP Racing Radi-Cal By STILLEN 6 Piston Big Brake Kit For The 2005-2014 Mustang


Coming from AP Racings incredibly successful race Radi-CAL caliper; and after years of development, AP Racing has released their new pressure forged aluminum Radi-CAL caliper line for high performance road use and weekend track use. Using the latest industry software and brake dynamometer testing, the AP Racing Radi-CAL caliper was designed to implement the latest caliper technologies learned through more than forty years of highly successful motorsports participation including over 725 F1 Grand Prix victories.

Every AP Racing Radi-Cal by STILLEN big brake kit is designed specifically for the vehicle it's being installed on. By utilizing both AP Racing rotors and Radi-Cal calipers, STILLEN engineers the specific vehicle mounting hats and brackets. These components are designed and engineered in STILLEN's Costa Mesa, CA. R&D department and machined in STILLEN's in-house machine shop using the latest technology in CNC lathe and mill machining. Every brake system consists of specific rotor sizes, pad selection, and caliper configuration to suit that application with the intention of developing the perfect match for that vehicle.



Calipers: AP Racing Radi-Cal™ 6 Piston Caliper (CP8522)

  • Lightweight, pressure forged aluminum alloy 2 piece racing derived high performance road caliper 
  • New asymmetrical higher strength caliper body design
  • Fixed radial mount opposed piston for maximum stiffness 
  • Hard anodized with a 2 stage paint for a durable finish
  • Differential piston bores to minimize pad taper
  • Dust seal equipped for everyday use for street and track performance 
  • Equipped with anti-rattle clips to eliminate pad chatter



Rotors: AP Racing 370x36mm /14.6 x 1.42” Rotor (CP3784)

  • Two piece floating rotor assembly with billet aluminum hat
  • 48 directionally curved vane design for maximum cooling
  • AP Racing Wide Disc Technology (WDT™) 
  • Available with patented J-Hook™ or cross drilled and slotted braking surface



Brake Pads: AP Racing / Ferodo DS25HP+ Compound

  • High friction coefficient for maximum stopping power
  • Excellent linear grip cold to 1300F degrees
  • Great for high performance street and limited track use
  • Extra large pad surface area for lower operating temperatures (108.9 cm²)
  • Red or Black with AP Racing and Radi-Cal™ logo
  • Allows high temperature thermal expansion without rotor distortion 
  • Increased thermal capacity, decreased stress and temperatures


  • Vehicle specific STILLEN design balance calibration
  • Stainless steel DOT approved brake lines
  • Complete bolt on kit with hardware, caliper brackets and instructions included
  • Compatible with factory master cylinder, OE ABS, Traction Controls and Stability Control Systems.
  • Usually requires aftermarket wheels (see brake profile)
  • Does not include non ABS models



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