ON TWO OCCASIONS OF A REAR END COLLISION ON DRY PAVEMENT, WHILE TRYING TO AVOID COLLISION AND APPLYING THE BRAKES EXTREMELY HARD, I FELT LIKE THE VEHICLE SHOULD HAVE COME TO A COMPLETE STOP. INSTEAD THE VEHICLE DIDN'T STOP BUT SLID INTO VEHICLE AHEAD OF ME. I KNOW IT SOUNDS LIKE I'M BLAMING THE CAR FOR MY ACCIDENT BUT I HAVE HAD CARS STOP ON A DIME. THIS CAR DID NOT STOP ON A DIME. I HAD THE BRAKES APPLIED HARD ENOUGH THAT IT SHOULD HAVE STOPPED INSTEAD IT CONTINUED TO MOVE FORWARD HITTING THE CAR IN FRONT OF ME. BOTH INCIDENCES OCCURRED DURING STOP AND GO TRAFFIC UNDER THE SPEED OF 10-15MPH. I FELT LIKE THE CAR JUST CONTINUED TO MOVE SLIDING INTO THE OTHER CAR WHILE ON DRY PAVEMENT.