RussW Russ what brake system is on the car? Is it look stock like 10-11" rotors and single piston calipers? If you are spirited driving, and get on the brakes hard a couple of times, you can warp the rotors. Super heat does this. You also have a 460 motor under the hood. If it's all iron that's about 720 lbs of weight. Aluminum heads and intake is 110 pounds less. Since it only happens when stopping, it's the brakes. You can resurface rotors about 3 times. DON'T bother. Replace them. The problem with a resurfacing is cutting about .008"-.012" to straighten the surfaces up again, and the rotors will warp quicker because they are thinner and get hotter faster. I would tell you to upgrade to a 4 piston brake system and larger rotors in the Min. 12" to better 13". Larger surface more stopping power. Also look at cooling ducts for the front brakes. This will extend the life of the rotors and pads. I an sure Dennis O. can point you in the right direction with a better setup. It's safer too.
Rick L.