A lighter and more performant "Audi ceramic" front brake system was an option from 2007 model year onwards (and only with 19 inch wheels). It comprised cross-drilled, radially vented and floating Carbon fibre-reinforced Silicon Carbide (C/SiC) composite SGL Carbon discs, diameter and thick, with grey Brembo monoblock six-opposed-piston fixed aluminium alloy calipers. The discs have a much greater tolerance to thermal differences, virtually eliminating brake fade, and have a duration of five times greater than conventional iron discs. The ceramic brakes also reduce unsprung mass by around 50% and thereby improve steering response and overall handling.