Championship leaders Brawn arrived in Budapest with a major upgrade package which includes a new diffuser, rear wing and bodywork and they used Friday's first session to test their new parts with race fuel loads.
Hamilton will continue to run with an aerodynamic package suited to Monza's low-downforce circuit, which includes a rear wing with a lower angle of attack - approximately 40 degrees compared to Button's conventional rear wing, which is raised at around 70 degrees.