Referring to the portion of a wheel brake which slows the rotation of the wheels/tires to slow or stop a vehicle. Friction is applied through pads by way of a caliper to reduce the rotational speed. This item is a round disc and is normally placed between the wheel and hub assemblies and can be found on most modern motor vehicles.
A brake rotor is a component of the braking system.
Brake calipers squeeze a brake rotor hydraulically through brake pads.
The brake rotor connects directly to a wheel hub and acts directly on the rotation of the wheels.
Brake Rotor Image