Just got my hydo handbrake working in the coupe, Fairly straight forward apart from, having some trouble with the double flaring tool. Hopefully will get to test it out with some drifting and motorkhana soon. One tip for guys with r31 diffs, you cant use hydro with r31 calipers as they seize up. But commodore ones are a direct replacement. Found this out the hard way so will have to head up to u-pull-it tomorrow and get some calipers.