Catostrophic brake and hydraulic booster failure on 85 535i

I have an 85 535i. The last couple weeks I have notice my car has been shimmying bad after driving it for 5 mins or so. It got real bad at about 45mph. I then realized it was because my passenger caliper was
seizing. I was driving today and noticed the burning smell of the friction and was trying to get it home. When I would apply the brakes, the passenger brake was not engaging. I was at a light and noticed it was smoking and I pulled it off the road to cool it off. When I started the car, I backed up and the brakes were almost totally gone. I pulled back in the spot and saw fluid on the ground. It was ATF from booster resevoir. When I depressed the brake the fluid was flowing out of the top of the resevoir. The clutch works perfectly. It is a 5-speed manual. But when I depress the brakes, it goes to the floor and the atf spurts out the top of the resevoir. I opened the master cylinder resevoir and noticed it was full and some fluid had been force out of it. I am assuming I overheated my brake system and seized it. Has anyone seen this problem before?
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Get the car sorted before driving anywhere.
The brake assist is hydraulic. IIRC any surplus is pumped back up to the top, so fluid can come out even if the system is not over-filled.
Your brakes need a thorough overhaul by someone who knows what they are doing.
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