What causes a wheel lug to brake off by hand when trying to unscrew it?

AjaxGnome

New member
I changed the brake pads and after a few days they were still squeaking so I went and got a brake silencer spray and decided to remove the pads and do the job again. When trying to take off the wheel with a regular cross like tire iron the first nut seemed to be coming loose but ripped right off with a piece of the bolt. This also happened to another bolt.
 
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