With over four decades of innovation under their belt backed by intensive research and development DBA has positioned itself as a world leader in the extremely competitive marketplace of OE and aftermarket disc brake rotor solutions. Whether you are after some basic replacement rotors for your standard passenger vehicle 4x4 offroad or commercial vehicle weekend toy or a hard-tuned track car DBA has a set of rotors to enhance your vehicle's braking performance at a price and performance level to meet your unique requirements. DBA's 4000 Series and 5000 Series rotors can be further enhanced with optional slots known as T3 - 48 CNC machined tri-directional curved slots. Machined slots in the friction surface allow a channel for braking by-products - brake dust and gasses from the incredible heat - to escape. This has a multitude of benefits from reducing pad contamination controlling heat build-up and brake pad knock back. These combine to enhance braking performance and increase service life of the pads and rotors. Compared to more common straight slots the unique curved slot design reduces the noise associated with 'racing' brakes and minimises any detriment to pad surface condition. The 4000 Series take the same excellent XG-150 cast iron alloy used in the Street Series and are further enhanced with TSP - Thermal Stability Profiling. This additional heat treatment process takes detail down to the atomic level aligning the grain structure the compound to produce a uniform material. The result of this is the 4000 Series HD a superior quality rotor able to withstand greater levels of heat for a longer service life considerable resistance to warping from excessive heat events. Standard on every 4000 Series rotor is the inclusion of Thermographic Heat Paint Markings allowing the user to identify peak braking temperatures in extreme conditions. 4000 Series Automotive Superstore AfterPay ZipPay Humm