Bringing your Mustang to a stop quickly and efficiently is a top priority for any build. As you add horsepower, that requires more stopping power. Big brake kits combine high-performance rotors, calipers, and brake pads to deliver a major improvement over your stock brakes.
Most big brake kits feature rotors that are larger than the ones that came stock on your Mustang. Overheated brakes lead to brake fade, which reduces your stopping power. Larger rotors provide better heat dissipation and more brake torque.
Normally, the downside of larger rotors is their weight. But with high-quality aftermarket kits, lightweight materials are used to offset the added size.