This may be a stupid question but how do all these cars you see in videos do those smoke filled burn outs with out ruining the rear brakes or do they have what they used to call line locks back in the early 80's.I see alot of Shelby's and Boss videos where they are setting still,smoke rolling off the back tires,holding the brakes on as they do it.Tires are exspensive without adding the cost of new rear brakes too.