Alcon Rear Big Brake Kit – BMW 3/4/5/6 Series (GXX)

Developed exclusively for track and motorsport applications, this Alcon Rear Big Brake Kit delivers uncompromising performance, thermal control, and structural stiffness under the most demanding conditions. At its core are your choice of Alcon’s CAR36 or CAR49 4-piston rear calipers, paired with high-performance 343x28mm or 355x28mm two-piece rotors from Paragon or Alcon.

Designed to work with advanced front brake setups and aggressive aero packages, this rear kit provides the brake balance and thermal stability required to maintain control and confidence lap after lap. Not suitable for street use — this system omits dust seals in favour of raw performance and should only be used in closed-course environments.

Caliper Options

Alcon CAR36 (28.6mm / 28.6mm Pistons)

• Billet aluminium construction for reduced weight

• Balanced piston sizing for tunable rear torque
  

• Suits race platforms requiring compact caliper packaging

Alcon CAR49 (31.8mm / 31.8mm Pistons)

• Forged aluminium for maximum rigidity

• Increased piston volume for enhanced rear braking force

• Suited for high-downforce, high-grip setups

• Accepts discs up to ø355mm

Key Features

• Track use only – no dust seals; not suitable for road environments

• 4-piston rear motorsport calipers – CAR36 or CAR49

• Stainless steel pistons – resist heat transfer and maintain fluid integrity

• 2kg anti-knock back springs – prevent pad knock-off under high lateral loads

• Bolted pad retainers – improve rigidity and simplify pad changes

• Internal fluid crossover (CAR49) – eliminates external piping

• Rotor sizing options: 343x28mm or 355x28mm

• Paragon or Alcon 2-piece rotors – directional slotted design with heat treatment

• Compatible with 18” and larger wheels

Vehicle Compatibility

This system is designed for professional motorsport applications. Please contact us to confirm fitment for your specific platform or build.

• Brake pads not included – must be purchased separately