Probably because Chevy did all the R & D [$$] on the system and Firebird was viewed as a competitor. In production, Firebird used Pontiac-built rear axles.
The Van Valkenburg book Chevy=Racing? has valuable insight on the braking problems the T/A cars experienced. What they thought was severe brake fade turned out to be insufficient master cylinder fluid capacity under racing conditions. JL8 did not initially solve the problem. And, as it was designed for a lighter car, wasn't all that much better.
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