Hello Chris. There was a thread with Art Benstein earlier this year on stepped Ate rear pistons. As I recall, we more or less concluded that most if not all years of 240s with Ate rears had stepped pistons and most if not all 940s with Ate rears did not have the stepped pistons. As for 740s, I'm not sure we reached a conclusion, but I'm quite confident my '89 740 (the year ABS was introduced) did not have stepped pistons.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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