I removed the ebrakes from my last car, a 924S, when a lever in one of them failed at the track and interfered with the wheel bolt heads. For track use they were just unneeded unsprung weight and complexity. A lot of folks remove them from their track cars just because of the weight issue.
I put them back in to sell the car (anticipating a possible street/track buyer), a pita, but I expect the new owner will remove them again.
My current track car, '71 911 built out as a '73 RS, has functioning ebrakes. It's street legal and I'll probably leave them.
I guess the point is that apparently many track cars, including "stock" class club racers, go without this extra unsprung weight.
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