Vented Disc's versus Solid disc's

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"Vented" Dimpled & Slotted Disc
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"Vented" Dimpled & Slotted Disc

The brake disc is the component of a disc brake against which the brake pads are applied.



Vented

The design of the disc varies somewhat. Some are simply solid, but others are hollowed out with fins or vanes joining together the disc's two contact surfaces (usually included as part of the casting process/manufacturing) as the picture above illustrates. The weight and power of the vehicle determines the need for ventilated or solid discs.
The "ventilated" disc design helps to dissipate the generated heat and is commonly used on the more-heavily-loaded front of vehicles.
Discs may also be Dimpled & Slotted, where shallow channels are machined into the disc's surface to aid in the removal of road grim and gas that builds under use. On the road, Dimpled & Slotted discs still have a positive effect in wet conditions because the dimples and slots prevent a film of water building up between the disc and the pads. We recommend staying away from Cross-drilled discs as these may eventually crack at the holes due to metal fatigue. Cross-drilled brakes that are manufactured poorly or subjected to high stresses will crack much sooner and more severely.
DID YOU KNOW? The development of disc brakes began in England in the 1890s, The first mass production use of the modern disc brake was in 1955, on the Citroen DS, which featured caliper-type front disc brakes among its many innovations.

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