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According to official specifications at a glance:
http://www.mclarenautomotive.com/uk/.../techspec.aspx
Brakes Cast iron discs with forged aluminum hubs
Brake Size (F / R) 370mm / 350mm
Brake Calipers (F / R) 4piston / 4piston
Optional Brakes Carbon Ceramic disc
Optional Brake Size (F / R) 394mm / 380mm
Optional Brake Calipers (F / R) 6piston / 4piston
McLaren Optional Carbon Ceramics vs Standard Cast Iron brakes
Conversion Note:
Front Brakes: The Carbon Ceramic brake system utilizes the heftier 6 pot calipers, larger pads and the carbon air duct. Please note that the weight of the front 4 calipers in the picture taken includes the steel braided brake lines, bolt, caliper pins x 2 and pad spring (hidden from sight). This results about approximately 0.6kg (1.32lb) of weight savings per corner.
Rear Brakes: Both options utilizes the 4 pot calipers, so only the rotors differ. Other visible hardware changes include a new slightly larger bracket for the rear parking brake and the carbon air duct. This results approximately 2.2kg (4.84lbs) of weight savings per corner.
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Standard Brakes (Iron rotor replacement):
CCB Brakes (Converting to iron rotors)
Stock wheels 19" 8.5J Front; 20"x11J Rear
http://www.mclarenautomotive.com/uk/.../techspec.aspx
Brakes Cast iron discs with forged aluminum hubs
Brake Size (F / R) 370mm / 350mm
Brake Calipers (F / R) 4piston / 4piston
Optional Brakes Carbon Ceramic disc
Optional Brake Size (F / R) 394mm / 380mm
Optional Brake Calipers (F / R) 6piston / 4piston
McLaren Optional Carbon Ceramics vs Standard Cast Iron brakes
Conversion Note:
Front Brakes: The Carbon Ceramic brake system utilizes the heftier 6 pot calipers, larger pads and the carbon air duct. Please note that the weight of the front 4 calipers in the picture taken includes the steel braided brake lines, bolt, caliper pins x 2 and pad spring (hidden from sight). This results about approximately 0.6kg (1.32lb) of weight savings per corner.
Rear Brakes: Both options utilizes the 4 pot calipers, so only the rotors differ. Other visible hardware changes include a new slightly larger bracket for the rear parking brake and the carbon air duct. This results approximately 2.2kg (4.84lbs) of weight savings per corner.
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Standard Brakes (Iron rotor replacement):
Front 370x32 (RB 370x34); Rear 350x32
CCB Brakes (Converting to iron rotors)
Front 396x34 (RB 394x36); Rear 380x34 (RB 380x32)
Stock wheels 19" 8.5J Front; 20"x11J Rear
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