From BMW website:
BMW M Performance 18'' brakes
The champion in deceleration: Braking system for improved thermal resilience, even with an extremely sporty driving style. Cross-drilled and grooved, the internally ventilated lightweight sport brake discs prevent a film of water building up between the brake pad and disc and add to the motorsport look.
• 4-piston aluminium fixed callipers on the front axle, lightweight sport brake discs with riveted aluminium drum in 370 x 30 mm (diameter x thickness)
• 2-piston aluminium fixed callipers on the rear axle, lightweight sport brake discs with riveted aluminium drum in 345 x 24 mm (diameter x thickness)
• can be painted in M Performance red, M Performance yellow or M Performance orange, as desired, and includes a coloured M logo
• at least 1 inch larger than the standard braking system
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