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Dust seals are not a requirement for brake calipers as far as the ADRs are concerned. Dust seals are not even mentioned in the ADRs. Plenty of production cars in Australia have brakes that do not have dust seals.
But you will have more trouble getting a caliper like these passed here in Australia. Mainy because of misinformation as you can see by this thread.
We've certainly been happy with the performance of the better Wilwood calipers like Billet 6 piston.
But we have lots of options when it comes to brakes, so I doubt we will end up running with Wilwood in Australia.
Best advice was the first piece, contact your engineer about them.
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