TWO INCIDENTS, BOTH LIGHT RAIN DAYS, TRAVELING SPEED LIMIT, ON A CITY STREET - WHILE DRIVING I CAME UPON A SITUATION WHERE I WAS REQUIRED TO QUICKLY APPLY MY BRAKES. ONCE BRAKES WERE APPLIED, THE CAR DID NOT STOP AS SOON AS IT SHOULD HAVE AND HIT THE OTHER CAR. AFTERWARDS, ANYTIME I HAD TO TRY TO STOP, THE BRAKE PEDAL HAD TO BE ALMOST TO THE FLOOR BEFORE IT WOULD STOP. THE FIRST TIME, I TOOK IT TO BE LOOKED AT AND WAS TOLD THAT THE BRAKES WERE FINE. THE SECOND TIME, I WAS COMING UPON A LIGHT THAT WAS ABOUT TO TURN RED. I PUT ON MY BRAKE AND THE CAR ONCE AGAIN DID NOT STOP IN THE TIME THAT IT SHOULD HAVE.I WAS ALMOST IN THE MIDDLE OF THE INTERSECTION BEFORE THE CAR STOPPED. I HAD ALREADY HAD MY BRAKES AND ROTORS LOOKED AT SO I KNEW THAT IT WAS NEITHER OF THOSE. FOR THE REMAINDER OF MY DRIVE, I HAD TO PRESS THE BRAKE ALMOST TO THE FLOOR BEFORE IT WOULD STOP. WHEN I DROVE IT AGAIN AFTER WORK, 8 HRS LATER, THE BRAKES WERE BACK TO NORMAL.