Brake Switch
WARNING: This page is about a different car, the 2003 Mazda B4000, 2002 Mazda B4000, 2002 Mazda B3000, 2001 Mazda B4000, and 2001 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
The brake switch is located on the brake pedal. The brake must be depressed in order to make a range shift from 4WD high to 4WD low or back.