pidurduspinnas

The term "pidurduspinnas" is an Estonian word that translates directly to "brake disc" in English. It refers to a component in a disc brake system, which is a type of brake that uses calipers to squeeze pairs of pads against a brake rotor (disc) with the aim of creating friction. This friction slows down the rotation of the rotor, which in turn slows down the vehicle.

Brake discs are typically made of cast iron, but can also be made from other materials such as steel, aluminum, or even carbon fiber composites. The material choice depends on factors like cost, performance requirements, and weight considerations. They are usually circular in shape and are mounted onto the wheel hub, rotating with the wheel.

The braking force is applied when the brake pads, housed within the caliper, are pressed against the surface of the spinning brake disc. This contact generates heat due to friction, which is then dissipated into the surrounding air. Over time, brake discs wear down due to this friction and can become scored or warped, requiring replacement to maintain effective braking performance.

In some applications, particularly performance vehicles, brake discs may be drilled or slotted. Drilled discs have holes to help dissipate heat and expel gases and water, while slotted discs have grooves on their surface for similar purposes. These modifications aim to improve braking performance under demanding conditions.