DBA DBA42858 Series HD Brake Disc Rotor - 4000

The DBA DBA42858 is a 4000 Series HD disc brake rotor — a direct-replacement, single-piece performance rotor engineered for drivers seeking upgraded braking performance above and beyond standard OE levels. The 4000 Series HD variant features a smooth OE-style rotor finish, popular for drivers looking for the benefits of a 4000 Series rotor but requiring an OE style look, such as controlled race divisions.

Cast from high carbon alloyed iron and undergoing Thermal Stability Profiling, DBA's metallurgy can handle the increased stress and heat generated under intense braking applications, time and time again. Featuring DBA's Kangaroo Paw ventilation that implements a series of 144 diamond and teardrop patterned pillars, DBA achieves up to a 30% increase in surface area and 20% improvement in cooling efficiency compared to a traditional straight vane design.

Key Features:

• CBN (Cubic Boron Nitride) machine-turned finish, minimising disc thickness variation and the potential for pad "knock" and resulting premature wear.
• Symmetrical slots and/or chamfered drill holes facilitate the exit of friction dust and gases, for a quieter and more responsive pedal feel.
• Symmetrical slotting and/or drilling for universal left/right fitment.
• Heat treatment cycles realign the microstructure of the iron, resulting in increased rotor stability and durability.
• Centre split core castings for increased heat transfer and thermal efficiency.
• Painted non-friction areas to prevent rust and enhance appearance.
• Paint markings change colour at specific temperature thresholds to assist with the monitoring of braking temperatures and rotor fatigue.

The DBA42858 is sold individually and is a direct bolt-on upgrade delivering genuine performance gains while maintaining the clean, stock appearance required by many street and regulated motorsport applications.