I replaced both rotors up front, pads, ball joints, wheel bearings and one caliper, car drove great for a month then grinding. I noticed a line down the middle of the rotor, so I bought the most expensive pads and rotors autozone would sell me, two days later the same thing, I waranteed them out and now a couple days later the same thing. It also feels warped, the caliper is not siezed and the line is down the middle of the rotor.