Brake Disc Rotor

The rotating disc attached to the wheel axle and is clamped with brake pads to decelerate the vehicle.

CAD model of the brake disc and caliper

The brake system converts vehicle kinetic energy to thermal energy. The rotor generally absorbs about 90% of the energy that the vehicle generates.

The rotor absorbs this energy by means of conduction through friction couplingwith the brake pad.

This energy is then:

Initially most of the energy from a braking event is absorbed by the rotor. Therefore, initial rotor sizing is based on the energy output from a significant braking event and this is estimated from the kinetic energy of the vehicle before the event.

Lateral Run Out

The general specification for lateral disc run-out should be less than 0.15 mm but should not exceed 0.20 mm even in exceptional cases.

Solid Brake Disc

A brake disc that is solid metal between its friction surfaces.


David Phan, Dino Kondyles, "Rotor Design and Analysis; A Technique Using Computational Fluid Dynamics (CFD) and Heat Transfer Analysis", SAE 2003-01-3303

See also: Brakes, Disc Brake.

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Subjects: Automotive