You are doing the proper repair.
Although I'm sure you are working on an all drum car, the same can happen to a factory disc car also (captain. Obvious).
Thankfully GM used stainless caliper pistons. Most times a caliper can be easily rebuilt.
If you own one of the off brands ( Ford dodge) they generally use plastic pistons. Forget about bringing one of those calipers back with a kit.
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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