Brake discs

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Drilled or slotted brake discs — what is the difference?

Under hard, repeated braking, hot gases and pad dust build up between the brake pad and the disc. A thin film forms that reduces grip: the driver feels it as a soft pedal and a longer stopping distance. Performance brake discs delay this effect because they carry heat and gases away as they build up.

Drilled brake discs have holes drilled through the friction surface. They give gases and water a path away from the pad, increase the cooling surface and reduce the mass of the disc. They are an excellent choice for road driving and the occasional track day.

Slotted discs have grooves cut into the surface that scrape off the top layer of the pad with every rotation and carry away gases and dust. Because the material stays intact, they cope better with long periods of high load — which is why they dominate in racing. Combined versions, drilled and slotted at the same time, bring both advantages together and are the most effective at preventing brake overheating.