what year was the first 4 wheel disc brakes on z28 i am buying a 82 ,model in australia,i cant believe they got drum brakes on the rear,,

84 think had 10 bolts with disk untill 86 or so when the 9 bolts came out.

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ICON Motorsports

1st & 3rd
MM Black Diamond 538 F&AM

I just picked up an 84 rear disc out of a 84 z28 man it looks cool. needs minore woork though....3.73s going in new rotors and calapers to be safe. so basically yes 84s had the 10 bolt rear disc. not sure on who had it first though