The brake disc is attached to the vehicle via a hub and rotates in the direction of travel of the vehicle. When the brake pedal is depressed, the brake pads sandwich the brake disc from both sides, and the braking force is generated by the frictional force thus generated. The brake disc rotates together with the tires and wheels. To slow down or stop the vehicle, the brake pads sandwich the brake rotor to generate frictional force and compress the rotor to generate braking force.

When the brake pedal is depressed, hydraulic pressure is generated in the master cylinder, and the piston, which is a component of the caliper, is pushed out by the hydraulic pressure. This causes the pads to sandwich the rotating rotor, and braking force is generated by the frictional force of the pads and rotor. Brake discs are mainly made of cast iron and are designed and manufactured using a great deal of know-how about factors such as thickness, size (diameter), material composition and cooling performance. This ensures proper braking performance and durability of the vehicle.

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Hitachi Astemo's Brake Discs are designed and tested to support the vehicle braking requirements, while providing the smooth braking experience in various road conditions. Our high-performance products are made for consumers who prefer smooth handling of their vehicles.