Blue Bird is recalling certain model year 2013 Vision school buses manufactured from May 10, 2012, through June 7, 2012. The electronic module that activates the hydraulic brake pressure indicator light on the dash instrument panel when there is little, or no, pressure in the hydraulic brake system may have been omitted during manufacturing. Therefore, these buses fail to conform to the requirements of Federal Motor Vehicle Safety Standard No. 105, “Hydraulic and Electric Brake Systems,” Section 5.3 “Brake System Indicator Lamps”.