The 1994 300ZX in Forza has 3 Brake Upgrade levels available, and they all use default Forza Upgraded Brake models. They should be replaced with models from other Nissan cars
Street Brakes: Nissan 370Z Nismo Z34
Sport Brakes: Nissan Skyline GT-R R34
Race Brakes: Nissan GT-R Nismo R35