While driving down the road the ABS brakes (front driver and passenger rear) started tightening up then they temporarily released for a few miles. Then started tightening up again it continued to tighted and not release until it was completely locked down. Immediately pulled off road and brakes visibly caught on fire and damaged all components in the wheels. This could have been a dangerous situation for myself or others on the road if it hadnt occured at a lower speed. This scenario has also occurred in 2 identical fleet vehicles purchased on the same date and the incidents occurred 3 months apart. There were no warning lights on at the time of the incidents. The vehicle was immediately taken to the dealership where they confirmed and repaired the issue. Vehicle was also inspected for an insurance claim. Dealership stated that it was the ABS system.