The 1983 R80ST has a single front disk brake on the right side of the front wheel. It uses a Brembo caliper connected to a master cylinder and fluid reservoir built into the right handlebar control unit. I repainted the caliper using black caliper paint.
Here is what the caliper looked like when I got the bike removed it from the bike.
And this is how it looks after repainting and rebuilding.
This shows how I do the work.
Here is a short video summarizing the procedure. It is a mix of video from the 1983 R100RS and 1983 R80ST.
VIDEO: 1983 BMW R80ST Rebuild Front Brake Caliper