Mont G&J wrote:
Traveling through an interstate construction zone often times having the right side wheels on the rumble strip, about six miles down the road pass the construction a trucker pulled alongside and motioned I had a problem. The picture below is what I found. Never heard or felt a thing when the wheel came off. The studs were sheared straight and even with the brake drum. That occurred in 2008, in 2014 found one stud broke all the rest were fine, and again in 2015 had two break. Like the OP I’m at a complete loss as to why, I always use a torque wrench and check the lug nuts frequently. Thinking the drum may have a crack or other defect I replaced it after the last two broke.
With the drum laying flat, holding a heavy duty center punch with vice grips, a two pound ball peen hammer and a good solid blow, the broke studs will pop right out.
![](http://i67.tinypic.com/25jbi40.jpg)
Looks exactly like what I'm dealing with. I did get off on the rumble strip several times yesterday, and that's probably what did the deed. I tried several times today with a maul and heavy punch and had no luck. I've got a friend who said he would take care of it at work tomorrow for me. Live and learn. Thanks for the pic.