UPON ENTERING A T-INTERSECTION WITH A STOP SIGN AT THE END OF OUR STREET THE BRAKES OF A 2015 ACURA MDX SH AWD WITH ONLY 2000 MILES WOULD NOT ENGAGE. WE WERE TRAVELING AT 50MPH AND DECREASED OUR SPEED TO 30MPH AS WE WERE COASTING, BUT COULD NOT GET THE VEHICLE TO STOP. THE BRAKES WERE PUMPED TWICE AS WE DECELERATED (SO REST ASSURED THE GAS PEDAL WAS NOT BEING PRESSED BY MISTAKE), BUT TO NO AVAIL AND WITH NO WHERE TO GO AND NOT ENOUGH TIME TO DO MUCH MORE WE COLLIDED WITH A SEMI TRUCK. IT WAS A HORRIFIC ACCIDENT THAT TOTALED OUR CAR AS THE SECOND TRAILER TIRES RAN OVER OUR HOOD AS HE WAS DRIVING AT 60MPH. LUCKILY DUE TO HIS HIGH SPEED OUR VEHICLE WAS THROWN AND WE LANDED UPRIGHT AND ALL AIRBAGS DEPLOYED WHICH IS THE ONLY REASON WE ARE ALL ALIVE. IT WAS A COLD DECEMBER MORNING WITH BELOW ZERO TEMPERATURES. I UNDERSTAND THERE ARE OTHER ACCOUNTS WHERE BRAKE PEDALS ARE NOT WORKING IN THE COLD OR WHERE DRIVERS ARE PUMPING BRAKES 4-5 TIMES TO GET THEM TO ENGAGE, OR DRIVERS ARE TURNING THEIR CAR OFF. WE SADLY DID NOT HAVE THAT KIND OF REACTION TIME. THIS COULD HAVE RESULTED IN 4 DEATHS AND I WOULD LIKE TO SEE ACURA LOOK INTO THEIR PLETHORA OF BRAKE PROBLEMS FURTHER AS THIS IS A BRAND NEW VEHICLE COMING OFF OF A BRAKE REDESIGN DUE TO THE EARLIER MODEL RECALL. *TR