The first time I saw that I didn’t immediately think brakes since I’m used to seeing callipers and disks. The icon only really makes sense to me now that I’ve seen a drum brake open - and even then it’s backwards.
Unless the icon designer was looking at a dual calliper drift brake setup then I suspect it symbolically harks back to very early brake designs of blocks on the wheel!
It’s like the floppy disk icon on a pc to save. How many people under 20 have even heard of a 3 1/2 inch disk?
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