If have a 2000 gs 300. I've owned it for about 5 years, now has 200k miles on it. In the past year I have replaced my rear brake pads 4 times. 45 days ago new rotors, calipers and pads, they are worn down again. I thought I may have gotten cheap pads so last time I bought upgraded ebc pads and discs and they only lasted 45 days. Thought it might be my master cylinder going out but this only happens to rear brakes and not front breaks, so not sure. In the 45 days I drove about 4000 miles. Any ideas? I don't drive hard.