The next step would be to measure the "lateral run-out" of the front wheels. That is done with a dial indicator that measures down to.001". If run-out is excessive, as in more than about.045", a bent wheel is a possibility, but first you would remove it and remeasure run-out on just the brake rotor. If any is found there, the new rotor would be the first suspect, but you also must check for any rust, scale, or other debris that got stuck between the rotor and hub, or between the rotor and wheel. That happens rather often, especially with cast aluminum wheels that are starting to corrode.
It's pretty common too for new rotors to be warped. A light machining will take care of that.
Monday, April 28th, 2014 AT 4:05 PM