Martin it was the standard bmw master cylinder not sure of the part No. but it came from a 1989 325i Sport and i believe it is the later of the two different types. Looking at the autodata manual the insides of the two units have very much the same fitting to the servo so i guess the problem would be the same for both. To check yours with the adaptor plate fitted to the servo the servo rod should be flush with the outside edge of the plate mine was 8mm short and it looks as though its due to the thickness of the adaptor plate which by coinsidence is 8mm thick.
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