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Ok, some catch up- my dislike of the Ate calipers also includes that fact that in ut local climate, they seem to rust and seize much more commonly than the Girling- post mortem suggests that the sealing is about equal, but plating of the cylinders is weaker. Perhaps I've never driven on a set that worked properly...!
On my conversion, I used used 264 calipers, known to be good. They definitely had SAE thread bleeders and line fittings, even though the mount bolts were metric. They required grinding off of the little pads of metal on the attachment points to recenter the caliper on the rotor, as well as some other grinding with a 1/4" die grinder for clearance- this latter may actually have been unneccessary in the end, not sure. I used my own brake lines made of Http://www.goodridge.net components. All steel-very nice stuff, & DOT spec. I had tried IPd ones once in the past, but the fittings are aluminum or some soft material, and they cross-threaded despite my careful installation.
I would expect the 75 164 would have carried on with the 73-74 SAE mount, but have not spent time with parts books to try to confirm that. I did get the BremboN.A. dimensional catalog and the 240 rotors seem too far off to work. I can post figures in MM if anyone is curious.
My friend with the two GT3 cars did find fade, ... as did R&T both times they tested 164's - the vented about 50-60% less. I hae the Brooklands reprint series. BTW, the distances were not great even by the standards of the time. I'd agree with the writers who figured the main shortfall was in tire grip.
I have a friend localy with a trio of 240T's in various stages of mods, and he swears by taking out the rear limiters, but only pre 79-ish? Personally, I've not messed with that, but again, he's a super smart guy, and he and B20Paul both have had luck with it. Not sure the legalities of deliberately modding your car's brakes...
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