Damien, Hi
Yes, the Frua has a complete dual brake system, 2 master cylinders actuated by the pedal through a balance rod, 2 lines each going to each booster. As you said, front brakes are actuated by one booster and rear by the other. It is quite a simple system. The boosters and master cylinders are Girling and are standard, available anywhere. 60's Lambos used a similar system except the boosters are in the trunk. I will let you know which operate the front and the rear brakes, I have to look under the hood. If you are missing the window switches, good luck, I could not source them anywhere, let me know if you find any!
By the way, I have found a place for the steering wheel, I am going to send mine to be refinished there, If you are interested you can talk to the guy and have him copy it! He is in Florida, let me know. [
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Regards,
Emmanuel