I removed the twin front disk brake system and the rear single disk brake system. The rear brake pedal assembly had a kludge repair to fix the wobbling brake lever. And, the rust was so bad on the rear master cylinder linkage that I couldn’t remove the rear brake pedal and had to remove the master cylinder and rear brake pedal together.
You can see how I did this work here:
I shot some short videos of how all the brake system components are connected together.
VIDEO: 1983 BMW R100RS Front Brake Assembly
VIDEO: 1983 BMW R100RS Rear Master Cylinder Assembly
VIDEO: 1983 BMW R100RS Rear Brake Caliper Assembly
Here is what the bike looks like now. I will remove the disk rotors after I remove the wheels and tires.