WHEN PARKED FOR 15 TO 20 MINUTES WITH THE ENGINE RUNNING THEN MOVING FORWARD THE BRAKES DO NOT WORK. ACCORDING TO SAN MARCOS TOYOTA THIS IS NORMAL. SPEED OD VECHILE IS LESS THAN 5 MILES PER HOUR NO BRAKES AND THIS CAUSED A VERY MINOR REAR END COLLUISN. ACCORDING TO SERVICE THE BRAKE BOOSTER SHUTS 0FF.