Brake Pedal Position (BPP) Switch
WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Brake status comes from the BPP switch. The BPP sensor applies battery voltage to the PCM when the brake pedal is applied. The PCM uses this input to disengage the TCC , speed control and auxiliary idle (if equipped).