WHILE DRIVING/TURNING LEFT OUT OF A SCHOOL PARKING LOT, THE LIGHT TURNED GREEN, ALL CARS STARTING MOVING. GOING ABOUT 10-12 MPH, THE CAR IN FRONT SLAMS ON BREAKS, THE SAFETY FEATURE ALERTED ME AS WELL BUT WHEN ATTEMPTED TO PRESS ON THE BRAKES, THEY WERE RESISTING. I COULD NOT BRAKE AND HAD NO CONTROL OF STOPPING. THE WEATHER WAS DRY AND SUNNY THAT DAY. ABOUT 35 DEGREES.