He may have to wait until next year to make his Formula One return, but Ferrari's Felipe Massa will get the chance to sharpen his racing skills at his annual International Challenge of the Stars karting event in Brazil this weekend. It will be the first time Massa has driven competitively since he fractured his skull during an accident at July's Hungarian Grand Prix. The Brazilian will be joined at the charity fundraiser by a host of famous motorsport names including seven-time world champion Michael Schumacher 2010 Williams driver Rubens Barrichello, Force India's Vitantonio Liuzzi, former Williams' driver Antonio Pizzonia, 2004 Indycar champion Tony Kanaan and ex-F1 driver Christian Fittipaldi.

Disc brakes consist of a rotor and caliper at each wheel. Expensive carbon-carbon (the same material used on the Space Shuttle) composite rotors - introduced by the Brabham team in 1976 - are used instead of steel or cast iron because of their superior frictional, thermal, and anti-warping properties, as well as significant weight savings. These brakes are designed and manufactured to work in extreme temperatures, up to 1,000 degrees Celsius. The driver can control brake force distribution fore