I say they are garbage b/c....
They are garbage because they were engineered incorrectly or they just used the wrong materials. A brake piston should NEVER fall apart or shatter regardless of what temperatures or conditions its faces. They should have built the pistons out of metal as almost all high performance cars have (yes I know there are a few that come with ceramic, Porsche, etc but they have much better cooling) Speaking of cooling, if they would have designed the car to get more cooling to the brakes it might have helped mitigate the problem with the pistons. They look great but function horribly.
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