The Bosch Rear Brake Disc Rotor is a direct-fit replacement for Mazda CX-3 models built from 2019 to 2023. Runout is held under 0.05mm at the mounting face, which prevents the pedal pulsation that follows a poorly machined rotor. Vane geometry is matched to the original design so cooling airflow and thermal expansion behave as the factory intended. The Steel casting is high-carbon enriched for better damping and quieter braking. Supplied with a light protective oil film; clean with brake cleaner before fitting. Outside diameter is 280mm with a new thickness of 28mm and a minimum machining thickness of 20mm. The casting is fully machined, dynamically balanced and given a protective coating on the hat and edges to slow surface rust. Supplied new and backed by a 3 Years / 60,000 km warranty.