MERITOR WABCO IS RECALLING 1,021 STEERING ANGLE SENSORS (SAS), P/NOS. 444 120 004 0, 400 850 647 0, AND 400 850 666 0, WITH SERIAL NUMBERS BELOW 3404 WHICH WERE SHIPPED AS ORIGINAL EQUIPMENT FOR USE IN MOTOR COACHES AND EMERGENCY VEHICLES BETWEEN JULY 2007 AND FEBRUARY 26, 2009. INTERNAL FRICTION CAN DEVELOP BETWEEN THE SENSOR GEARS AND THE SENSOR HOUSING AS A RESULT OF EXTERNAL FORCES EXPERIENCED ON THE VEHICLE INCLUDING VIBRATION. IF DEVELOPED FRICTION IS GREAT ENOUGH, THE DRIVING TAB OF THE SAS CAN SHEER AS THE DRIVER TURNS THE STEERING WHEEL.