2013 Audi Q7 Brakes

I WAS DRIVING AND THE CAR GRINDER TO A HALT. THE BRAKE LIGHT CAME ON AFTER THE GRINDING. I CALLED A TOW TRUCK AND HE FOUND A BOLT ON THE GROUND THAT WAS HOLDING THE CALIPER/HUB TOGETHER. MY SPEED WAS AROUND 30 MPH BUT IF I WOULD HAVE BEEN ON THE HIGHWAY OR AT A HIGHER RATE OF SPEED I WOULD HAVE BEEN IN TROUBLE BECAUSE THE CAR WOLD NOT MOVE. MY BRAKES WERE JUST REPLACED 3 MONTHS BEFORE. ACCORDING TO MY MECHANIC THE HOUSING FOR THE BOLT THREADS WERE STRIPPED. THE BOLT HOLDS THE CALIPER AND HUB. A MACHINIST IS NOW TRYING TO RETHREAD IT. IT WILL BE A WEEK TOMORROW WITHOUT AS HE FIXES ANOTHER BOLT HOUSING IN THE HUB THE SAYS IS STRIPPED ALSO. MY MECHANIC SAID THAT THIS IS SOMETHING THAT SHOULD NOT HAVE HAPPENED ON A CAR LIKE THIS. THIS IS MY 2ND Q7-- SAME CAR ALMOST EXACTLY EXCEPT IT WAS A 2009 AND IT HAD 110000 MILES ON IT WHEN I SOLD IT AND HAD NO O PROBLEMS WITH IT.

TL* THE CONTACT OWNS A 2013 AUDI Q7. WHILE DRIVING APPROXIMATELY 5 MPH, THE BRAKE PEDAL WAS DEPRESSED AND TRAVELED TO THE FLOORBOARD. AS A RESULT, THE CONTACT REAR ENDED ANOTHER VEHICLE. THE AIR BAGS DID NOT DEPLOY. A POLICE REPORT WAS NOT FILED AND THERE WERE NO INJURIES. THE VEHICLE WAS DRIVEN AWAY BY THE CONTACT AND LATER TOWED TO THE DEALER (AUDI BROOKLYN 665 65TH ST, BROOKLYN, NY, 11220). THE FAILURE COULD NOT BE DUPLICATED. THE CONTACT WAS ADVISED BY THE DEALER THAT THE VIN WAS NOT INCLUDED IN NHTSA CAMPAIGN NUMBER: 14V516000 (ENGINE AND ENGINE COOLING, SERVICE BRAKES, HYDRAULIC). THE FAILURE MILEAGE WAS UNKNOWN.