The only really required "mod" is to the front knuckles, the r34's have a 14mm bolt instead of the s13/14/15/z32 12mm bolt, so the knuckle would need a drill but hell, they're bolt on brembo's lol. Rears are the same as stock. You actually use the stock s chassis banjo lines too, obviously upgraded would be best.
From my research the ebrake assembly from the z32/r32 should work in the rear drums too.
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