One problem related to brake light on has been reported for the 1999 Toyota Land Cruiser. The most recently reported issues are listed below.
While turning left at 5mph the abs and brake light suddenly went on and a high pitched sound came from the dash. The brakes failed completely with the pedal going to the floor and I rear ended the car in front of me. Had it towed to a Toyota dealer repair shop. Told that the abs activator master cylinder failed.