At the 1997 Austrian Grand Prix, Darren Heath, an "F1 Racing" photographer, noticed that the rear brakes of the McLarens were glowing red in an acceleration zone of the track. The magazine discovered through investigation that McLaren had installed a second brake pedal, selectable by the driver to act on any one of the rear wheels at the driver's control. This allowed the driver to eliminate understeer and reduce wheelspin when exiting slow corners. This system was entirely legal, but was an innovation, and hence gave McLaren an advantage. While "F1 Racing" suspected what McLaren were doing, they required proof to publish the story.