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Home >> Ford >> 2009 >> Expedition RWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission External Controls >> Description And Operation >> External Controls >> Brake Shift Interlock System - Floor
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Brake Shift Interlock System - Floor

The brake shift interlock system prevents shifting from PARK unless the brake pedal is applied. The brake shift interlock system consists of a BSIA  mounted on the floor selector lever. If the ignition switch is in the RUN position, the BSIA  is on unless the brake pedal is applied.