There is a rwd drift forester on ozfoz with a hydro handy. But its set up with a second set of calipers on the rear. Totoally independent of the standard brakes.

More mucking around, but least you wont have to cut into the stock brake lines to join in the extra cylinder etc. Last thing you want to do is hook it all in to the brakes, then have a blowout etc and lose brakes alltogether...

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Doing it for all the wagons out there