Brake discs are one of the major brake tuning options which a professional race team has at their disposal at any typical race weekend. There are many subtle changes that can be made to a brake disc casting or configuration which can drastically influence braking characteristics. A brake disc’s face type (slot / groove pattern) is one of those changes, and can influence many braking characteristics.
Some of them are:
- Initial response (bite)
- Control and modulation
- Pad wear
- Disc wear
There are also many variables which are considered when engineering a brake disc face type. Changing some of these variables can drastically influence the overall performance of the brake disc. Some (of the many) variables which are taken into consideration for brake disc slot design are:
- Slot depth
- Slot angle
- Length of slot
- Number of slots
Brembo and Brembo Racing primarily offer 4 different brake disc face patterns based on the application, intended use, driver preference, and other technical requirements of the application or chassis.
- Benefit: offers the highest initial response of all the available disc face types while continuously refreshing the braking surface and being also typically a bit lighter.
- Drawback: Drilled discs are generally more prone to heat checking and thermal cracking if used consistently at extremely high temperatures. This however, really depends on the track, driver, and chassis setup.
Type-1: Brembo “8 straight – slot” face type with an emphasis on stable brake feel and improve resilience against thermal cracking.
Type-3 (Aggressive Face Type): motorsport developed face type with an emphasis on high initial response while maintaining a smooth pedal release.
Type-5 (Endurance Face Type): motorsport developed face type with marginally less initial response compared to the Type-3 face type. The Brembo Racing Type-5 face type was also designed to have lower pad and disc wear for certain long distance endurance races (mostly 10, 12 and 24 hour races).
- Benefit: braking modulation and control
- similar to Type-3, while offering lower overall pad and disc wear on the track.