I replaced the front pads and had the rotors turned last weekend. I told the gents that they may be warped because of the driver side caliper recently locking up, which was replaced in April, as well as the passenger side having a tendency to stick unevenly. He said it might not be possible with their old machine, but they'd give it a try. They were able to get them turned and guaranteed them to be true. Ever since then, I have a shimmy/ shake in the steering wheel at about 50 mph. It goes away at about 55 mph and above. I thought the passenger side caliper was the culprit so I replaced it with no luck. It had needed replaced anyways so it wasn't a complete waste.. The $20 to turn the rotors might have been though. Are the rotors the issue? They are the only thing that has changed since this has happened.