Last week the Minnesota State Patrol received a tip that buses from Minnesota City Bus company were missing a brake sensor that alerts drivers when brakes aren't working properly.
Minnesota Bus Company contracts with the Winona Public School District.
After some investigation, Winona Area Public Schools Superintendent, Scott Hannon, says the district learned that a mechanic had removed the sensors 8 or 9 years ago after being told by Blue Bird bus company officials they could be removed due to corrosion.
Hannon says the Minnesota State Patrol launched an investigation and discovered seven of the district's buses were missing the safety sensor. Hannon says 5 buses were back on the road right away after having the part replaced.
Hannon says the sensors alert the bus driver when the brakes are not functioning properly. Hannon says ALL the buses used by the district have been inspected again and are safe.