As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LGA - FLT 4547 - ON TAKEOFF ROLL, OUTBOARD BRAKE INOPERATIVE ON EICAS. ABORTED TAKEOFF AND RETURNED TO GATE. MAINTENANCE REMOVED AND REPLACED THE LEFT BRAKE SHUTOFF VALVE IAW EMB MM. OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)