Brake Master Cylinder problems of the 2008 Honda Accord

Ever since I purchased my 2008 Accord, I had noticed a 'squealing' sound upon acceleration, that seemed to be coming from the rear wheels. It was faint at first, and would come and go, so I didn't think anything of it, especially since my vehicle was new. Visually, though, I thought my rear wheels had a 'rusty' appearance on the inside of the wheel well. As time went on, the noise became more consistent, and was audible during deceleration, too. Not to mention, I began to hear a 'grinding' sound. I took my vehicle into the dealer, with the assumption that whatever the cause, my extended warranty would be useful, if there were any needed repairs. The dealer told me that I had worn down the brake pads so badly that the pads, rotors, and calipers needed replacement. In addition, the master cylinder and piston were damaged (due to the brake situation), so that needed replacement too. I asked why the brakes would even need replacement at such a low mileage, in the first place, especially since almost all of my miles are highway miles, and they told me that it was very common, and since I was 'negligent' the cost would not be covered under the warranty, and, therefore, I would be charged $1,667. 00 for the repairs. My vehicle is in their shop right now, as of course, they don't even have the parts to fix it, and the vehicle "is too dangerous to drive. " maybe I should have been more proactive and went with my gut when I thought the 'squealing' sound was strange, but I just figured a brand new car wouldn't have any problems. Unfortunately for me, I was completely wrong!.