Among the new features found on the 2007 911 Turbo is the Porsche Stability Management (PSM) system, which includes enhanced brake functions such as pre-loading of the brakes, which detects when you abruptly lift your foot off the gas pedal and then instantly pumps brake fluid from the PSM control unit to the brakes, readying them for action before it even feels your foot on the brake pedal. PSM also allows for a certain level of brake pressure without applying maximum brake force so you can “feather” the brakes to retain forward momentum.