Dog, just curious why you feel this way? I have had rotors turned for 26 years with no adverse affects.

 

I believe what he's saying is if they're warped they're no longer in round. If they were just cut say as the rivets from the pad cut them then they could be turned and have metal shaved off. If a rotor is no longer round than they're useless (looking at them head on with the thin rotor part in front of you they're not straight)

 

you lost me cowboy! turning and cutting are two different terms for the same thing! making an imperfect flat surface smooth again. I know once a rotor gets under a certain thickness they are junk. but I turn rotors at every pad change, if rotors are in tolerance.

 

He's saying the whole rotor isn't straight. So if you put it down on the ground flat, there would be a part of the rotor not touching the floor. The whole rotor is bent.

 

but turning fixes that

 

I forgot to mention that my truck pulls right a little, if that matters in diagnosing.

As for the thud noise, I would say it sounds like when you go over expansion joints on the expressway.

 

lift the truck up on stands, take off the rear wheels, start the car and put it in Drive. I hope this isn't the case but if the rotor and caliper are wobbling all over the place you might have a bent axle. Also watch the tire in the mirror while driving for slight wobbling. Thought i had warped rotors but had a bent axle and it sounds a lot like what you might have going on