Brake Pedal Position (BPP)
WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The Brake Pedal Position (BPP) switch tells the PCM when the brakes are applied. The Torque Converter Clutch (TCC) disengages when the brakes are applied and the BPP switch closes when the brakes are applied and opens when they are released.