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well it's not the calipers that have them on my ae92, They are on the pads.
and the reason not all cars have them is different calipers have different systems. It's to keep some tension on the pads to push them away from the rotors...
Some don't have then true, but usually thats because they are old and didn't have them back then, or because they were lost over many years.
Hell some cars like the neons came out with them after to fix that issue... Try putting those on cars they weren't designed for them ....
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