We haven't had any sort of problem like that. We've run either Porterfield or Carbotech shoes, and are getting a full season of enduros (5-6 1.5 hour races + qual and practices) out of a set of drums before we remove them and have them turned, but have yet to have a complete failure on a drum. All of our drums are O.E. older parts. If you're in a 280, I'm sure the extra weight of the chassis would be harder on various components of your brake system, and if I remember right the rear brakes on a 280 use a different wheel cylinder, and attach a little differently. Maybe it's a bit more efficient than a 240's, and you are getting better braking/generating more heat on of your drums than we are. I know we struggle to get our shoes to wear evenly, with them commonly wearing significantly more on the inner 2/3rds of the crescent.
Chris Carey
Central Florida Region
ITS/Vintage Datsun 240Z
Favorite tool to remove undercoating---- A curb!
"Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car.
Horsepower is how fast you hit the wall, torque is how far you take the wall with you."
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