Brake Drum Wheel Cylinder problems of the 2016 Toyota Corolla

Dolan Toyota scion informed me that my brake caliper was leaking--I would have to replace the assembly cylinder-- it could not be repaired. I needed new pads and the rotors to be resurfaced. The car was unsafe to drive I had to have them repair it. Total bill: $794. 01. The issue is why did this happen? several mechanics and even the service manager at dolan agreed that this was a rare event on a car with 36000 miles. It points to a defective part or a problem in the manufacturing/assembly process. The warranty has run out on this vehicle, but I think Toyota should accept some responsibility in this case. They sold me a car with defective brakes that could have caused an accident. This is a serious issue. I called Toyota motor sales,USA, inc, I think they should be responsible for the whole $794. 01 bill or at least a part of it! the disagreed with me--they want no responsibility for selling me a car with defective brakes that could have caused an accident. This should not have happened--they are responsible. Could you investigate? I have included a copy of the repair invoice and a copy of an e mail from Toyota motor sales. My case number is:2004071297 and their number 800-331-4331. Please let me know if you need any further information. Frank j winkler /623-256-7735/ fjwinkler999@gmail. Com/ 590 lake street, unit 1002, reno, nv 89501.