It sounds like the rotors were not installed properly when they were replaced. They should not come loose on their own. The catch is, can it be proven that the shop is at fault?
As for the damages caused if those parts all get tangled up at anything over a walking speed. I would expect to see major internal damage to the differential and maybe even a twisted axle or housing. There is a lot of inertial force in those parts.
It is different if you were to climb on the brakes and lock up the rears. In that case you are slowing/stopping both sides the same amount and you will probably not have your foot on the gas. So although the system would get a hard shock, it would be spread through the parts and not cause any real damage other than flat spotted tires and maybe needing the seat cleaned.
Your thinking is correct as to why the parts are damaged. If one side suddenly locked up, Something is going to break.
As for the shop, If it were me I would tell them I plan on never using them again, and that I will be sure to tell others who go there how they treated me.
Tuesday, April 11th, 2017 AT 2:33 PM