Brake-Shift Interlock

A shift interlock mechanism is used on Mustang vehicles with an automatic transmission. This is to prevent shifting the transmission out of the PARK position unless the brake pedal is depressed. The system consists of a solenoid assembly attached to the key interlock assembly, a bracket retaining the solenoid, and the necessary wiring. The solenoid is energized when the ignition switch is turned to the ON position, locking the shifter in the PARK position. When the brake pedal is depressed and the stoplamp switch is activated, the shift-lock solenoid is deactivated and the shifter can be moved out of the PARK position.