2nd gen TA has smaller pistons on the rear calipers to reduce rear braking.
Around 45 percent of the cars weight is on the front wheels, plus whatever transfers forward when braking hard, maybe 200 lbs from that.
So braking "power" would have to be in proportion to that "dynamic weight balance".
But on slippery surfaces there is less braking traction, so less forward weight transfer. The car would need a bit more rear brake to balance under these conditions.
Then add a full load of passengers and luggage... the need for rear brake would go up, but you can't, because the car won't balance when empty...
So, there are compromises in the factory brake system balance to prevent rear lockup in most any weather condition and load configuration.
Plus a safety margin so the rears NEVER lock first, on a production car.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327 original owner. 69 Camaro Vintage Racer, 65 Lola T-70 Chev SB Can-Am Vintage Racer