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I looking into this on my early 1967 122, I was comparing diagrams in the dealer parts catalog from 1971. You'll need a number of parts not the least of which is a new master cylinder. You'll also need the dual circuit junctions for the front and rear sections, a second (or entirely new) set of brake lines, and new calipers. The single circuit system uses one-line caliper. while dual circuit has dual line calipers. I think this is why they are dual triangular systems (each system controls 3 wheels). If you go for a 122/1800 rear axle switch you have won half the battle.
In looking at a lot of engine pictures, I think the master cylinder mounting bolts will have to be moved (need to be horizontal not vertical to work with any of the dual-system master cylinders.
I couldn't tell you what kind of trouble this would be, but I gleaned this much just from comparing the dealer diagrams. It may involve a lot more that just a new master cylinder, lines, junctions, and calipers. It's a worthy upgrade if you ask me, but it may not be feasible if you don't have many old volvos available where you are.
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You mean Volvo makes cars that are *NOT* Wagons?!?
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