It didn't take long for me to confirm that the 72mm was the same pattern as the e30 booster, and I had one on the way in the mail. He also documented how he got the booster installed in his Volvo, which included the bolt pattern at the firewall: Not only did he have documentation for the pinout for the unit he used, which was from a Tesla: Searching specifically for that, I came across Lars, (a Volvo 122 Amazon enthusiast like my brother) in the Netherlands. which makes complete sense, because if you lose a data connection you'd like to have the booster go back to "dumb" mode. I found a reference on a DeLorean forum from YEARS ago about these boosters working in a failsafe mode. When I got back from the yard I was convinced this was worth looking into, but the size of the plugs to these boosters was pretty intimidating. When your brake force request exceeds what the regen system can provide, it starts to add hydraulic braking with the electronic booster. A lot of these have an electronic brake booster to allow for the computer to decide how much brake is provided by the hydraulics, and how much is provided by the regenerative brake system (so under light braking, you might push the pedal with 30% effort, and it might feel like your brakes are being boosted, but it's actually the electric motor braking to recharge the batteries). I spent an afternoon with hoveringuy picking up an engine for his swap at a specialty wrecker near us, and I think he was getting a little tired of me ducking in and out under the hood of every EV and hybrid on the lot. I'm working on a swap right now and had resolved myself to doing a manual pedal box to avoid this whole situation. I thought I'd post this here since it's the brakes section, but this is mostly of interest to anybody doing a swap who's been struggling with finding a booster that will fit against a 24v intake manifold.
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