As said all 182's had cruise control/speedlimiter, The main on/off switch for the cruise control/speedlimiter is on the dash to the right of the steering column, when the top or the bottom of the switch is pressed in it should stay in that position and not flip itself back to the centre position, if that happens then the switch is faulty(common problem), if that switch is working ok, then the brake light switch could be out of adjustment or faulty.