Brake Discs

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The brake disc is the rotating part of a wheel's disc brake assembly, against which the brake pads are applied.

The design of the discs can vary. Some are solid, whilst others are hollowed out. The weight and power of the vehicle determines the need for this type of disc. The 'ventilated' disc design helps to dissipate heat and is commonly used on the more-heavily loaded front discs.

Additionally, discs for many cars often have holes cut through the disc. This is done for even better heat dissipation, to aid surface-water dispersal, to reduce noise, to reduce mass, or for simply for marketing cosmetics.