BRAKE PEDAL BECAME EXTREMELY HARD TO PUSH FIRST INSTANCE WAS SLOWING TO MAKE A RIGHT HAND TURN AFTER NEARLY CRASHING GOT VEHICLE STOPPED AFTER SITTING FOR A WHILE BRAKES RETURNED TO NORMAL OPERATION. SECOND INSTANCE BACKING INTO PARKING SPACE PETEL WENT TO FLOOR NO BRAKES THEN PETAL CAME UP AND WAS EXTREMELY HARD TO PRESS DOWN HITTING ANOTHER VEHICLE IN THE PROCESS. AFTER A PERIOD OF TIME BRAKES WENT BACK TO NORMAL OPERATION.